• Home
  • Latest
  • Fortune 500
  • Finance
  • Tech
  • Leadership
  • Lifestyle
  • Rankings
  • Multimedia
Financetrial
Asia

Trial of founder of one of South Korea’s biggest internet firms mixes K-pop stock-rigging with pushback on billionaires

By
Yoolim Lee
Yoolim Lee
and
Bloomberg
Bloomberg
Down Arrow Button Icon
By
Yoolim Lee
Yoolim Lee
and
Bloomberg
Bloomberg
Down Arrow Button Icon
September 11, 2024, 7:00 AM ET
Brian Kim, founder of Kakao Corp., center, arrives at the Seoul Southern District Court in Seoul, on July 22, 2024.
Brian Kim, founder of Kakao Corp., center, arrives at the Seoul Southern District Court in Seoul, on July 22, 2024. SeongJoon Cho—Bloomberg via Getty Images

Kakao Corp.’s founder goes on trial Wednesday to face allegations of rigging prices during the takeover battle for K-pop powerhouse SM Entertainment Co., a watershed moment for South Korea’s internet and media industries.

Brian Kim — who built a simple messaging service into a $22 billion empire spanning social media, content and fintech — is grappling with charges he tried to thwart BTS-agency Hybe Co.’s rival bid by pushing up SM’s price. The billionaire entrepreneur goes on trial in Seoul alongside three former and current Kakao executives, also charged with manipulating the target’s stock. 

It’s a dramatic setback for one of South Korea’s highest-profile entrepreneurs, once hailed for helping transform an economy ruled by dynastic family-run conglomerates (or chaebol). Kakao today provides much of the country’s 50 million people with messaging, banking, gaming and taxi-hailing services.

At the trial’s first, mainly procedural, hearing on Wednesday, the presiding judge stressed he would like to move the case along efficiently. He set the next hearing for Oct. 8.

1. Who is Brian Kim?

The 58-year-old tycoon, known in Korea as Kim Beom-su, founded the company that would become Kakao in 2006. Four years later, he started the massively successful KakaoTalk messaging app, which would go on to become the heart of the country’s 15th largest conglomerate by assets. 

At one point, Kim — who as a boy shared a room with seven family members — briefly surpassed Samsung Electronics Co. Executive Chairman Jay Y. Lee to become the country’s richest person. His fortune has since plummeted, from a peak of more than $14 billion to around $3.2 billion as of this week.

The trial marks a low point in Kim’s rags-to-riches story, and a shift in perceptions. Kim and fellow entrepreneurs like Coupang Inc.’s Bom Kim were once hailed as visionaries who prevailed against Silicon Valley titans to carve out their own stakes on the internet — foils to the steel firms and shipbuilders that control Korea’s business landscape. Kim encouraged colleagues to call him Brian and address each other by their English nicknames, eschewing the titles that are the norm in Korean corporate culture.

But as their power rose, government officials grew concerned about the way internet services were displacing incumbents in fields like banking, retail, entertainment and even mom-and-pop physical stores. Kakao’s proliferation into more than 120 affiliates has also sparked criticism about governance.

2. Why is the Kakao founder on trial?

Kim has remained in detention since July, when the Seoul Southern District Court granted prosecutors’ request for a detention warrant. They cited substantial evidence of Kim’s involvement in manipulating SM’s stock price, concerns about evidence destruction and flight risk. 

In the following month, prosecutors indicted the entrepreneur with charges of market violations during the takeover battle, paving the way for September’s trial. 

3. What is the evidence on each side?

Prosecutors accuse Kakao and unit Kakao Entertainment Co. of buying 240 billion won ($179 million) worth of SM shares at inflated prices, to fend off its rival suitor. Hybe, the agency that represents the hit boy band BTS, had purchased a 15% stake from SM founder Lee Soo-man, and proposed a buyout at 120,000 won per share. 

Both Hybe and Kakao craved ownership of SM as a way to reach a broader audience. Kakao executives are accused of carrying out their alleged maneuver in February 2023, sending SM’s shares to record highs. Hybe ultimately backed down, and Kakao and Kakao Entertainment took control of SM in March.

In October, authorities arrested Kakao’s chief investment officer, Bae Jae-hyun, in connection with the bidding war, plunging the company into crisis. Kim has repeatedly denied any wrongdoing.

Prosecutors are expected to argue in court that Kim and his lieutenants interfered in the M&A bidding process when they allegedly artificially bid up SM’s stock price, and illegally tampered with market levels.

4. What happens if he’s convicted and how would it affect Kakao?

The current trial focuses on Kim’s role, whether he was directly involved or condoned the alleged actions. The case could drag on for months, potentially much longer depending on the appeals process. 

A conviction could have implications both for Kakao and the broader economy. Kim faces jail time, which would slow the company’s investment in artificial intelligence and hamper overseas expansion and listing plans. Kakao at one point considered listing Kakao Mobility Corp., the nation’s dominant taxi-hailing service. 

Kakao could be forced to relinquish part of its 27% stake in KakaoBank Corp., the country’s leading internet bank. Under Korean law, individuals and entities convicted of financial crimes are restricted from owning more than 10% of a financial institution.

More broadly, it could potentially exert a chilling effect on fast-growth businesses in general, given criticism that Kakao expanded so rapidly it began to squeeze smaller competitors.

5. Why do so many South Korea CEOs get prosecuted?

Kim is just the latest in a long tradition of prosecutions for corporate tycoons. The country took steps to enforce laws around white-collar crimes and corruption in response to a public outcry over perceived corporate wrongdoings in the aftermath of the 1998 Asian financial crisis.

The turmoil around that period, when the won collapsed and thousands of small businesses went under, highlighted for many the cozy relationships between family-run chaebol and politicians. Ordinary South Koreans are increasingly questioning the consolidation of wealth among a handful, and the stifling effect that’s had on small businesses and startups. 

Many citizens now view large companies as a threat to democracy and economic equality, said Kim Sung-soo, a professor of political science at Hanyang University in Seoul. They have led to public support for persecuting high-profile executives such as Samsung’s Lee.

At the same time, others criticize the relatively lenient sentences that arise. Lee was pardoned and released early. 

Join us at the Fortune Workplace Innovation Summit May 19–20, 2026, in Atlanta. The next era of workplace innovation is here—and the old playbook is being rewritten. At this exclusive, high-energy event, the world’s most innovative leaders will convene to explore how AI, humanity, and strategy converge to redefine, again, the future of work. Register now.
About the Authors
By Yoolim Lee
See full bioRight Arrow Button Icon
By Bloomberg
See full bioRight Arrow Button Icon

Latest in Finance

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025

Most Popular

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Rankings
  • 100 Best Companies
  • Fortune 500
  • Global 500
  • Fortune 500 Europe
  • Most Powerful Women
  • Future 50
  • World’s Most Admired Companies
  • See All Rankings
Sections
  • Finance
  • Leadership
  • Success
  • Tech
  • Asia
  • Europe
  • Environment
  • Fortune Crypto
  • Health
  • Retail
  • Lifestyle
  • Politics
  • Newsletters
  • Magazine
  • Features
  • Commentary
  • Mpw
  • CEO Initiative
  • Conferences
  • Personal Finance
  • Education
Customer Support
  • Frequently Asked Questions
  • Customer Service Portal
  • Privacy Policy
  • Terms Of Use
  • Single Issues For Purchase
  • International Print
Commercial Services
  • Advertising
  • Fortune Brand Studio
  • Fortune Analytics
  • Fortune Conferences
  • Business Development
About Us
  • About Us
  • Editorial Calendar
  • Press Center
  • Work At Fortune
  • Diversity And Inclusion
  • Terms And Conditions
  • Site Map

Latest in Finance

An elderly man prepares ingredients, grating carrots on a plate in a home setting, emphasizing independence and routine.
North Americaaging
More Americans will die than be born in 2030, CBO predicts—leaving immigrants as the only source of population growth
By Eva RoytburgJanuary 7, 2026
20 hours ago
Delta plane flying
North AmericaAir Travel
These are the 10 most on-time airlines in the world, and only one American company made the cut
By Jacqueline MunisJanuary 7, 2026
23 hours ago
corner office
Future of WorkJobs
AI layoffs are looking more and more like corporate fiction that’s masking a darker reality, Oxford Economics suggests
By Nick LichtenbergJanuary 7, 2026
23 hours ago
Real EstateHousing
Trump threatens to ban Wall Street from buying the house next door, saying ‘American Dream is increasingly out of reach for far too many people’
By Nick LichtenbergJanuary 7, 2026
24 hours ago
trump
Economynational debt
The $38 trillion national debt is one thing 82% of Americans agree on: ‘Voters are understandably concerned,’ watchdog says
By Nick LichtenbergJanuary 7, 2026
1 day ago
Real EstateHousing
Americans missed out on a ‘once-in-a-lifetime’ chance to buy a house—the 3 shifts it would take to make housing affordable are ‘very unlikely’
By Sydney LakeJanuary 7, 2026
1 day ago

Most Popular

placeholder alt text
Law
Amazon is cutting checks to millions of customers as part of a $2.5 billion FTC settlement. Here's who qualifies and how to get paid
By Sydney LakeJanuary 6, 2026
2 days ago
placeholder alt text
Economy
Mark Cuban on the $38 trillion national debt and the absurdity of U.S. healthcare: we wouldn't pay for potato chips like this
By Nick LichtenbergJanuary 6, 2026
2 days ago
placeholder alt text
Future of Work
AI layoffs are looking more and more like corporate fiction that's masking a darker reality, Oxford Economics suggests
By Nick LichtenbergJanuary 7, 2026
23 hours ago
placeholder alt text
Future of Work
'Employers are increasingly turning to degree and GPA' in hiring: Recruiters retreat from ‘talent is everywhere,’ double down on top colleges
By Jake AngeloJanuary 6, 2026
2 days ago
placeholder alt text
Success
MacKenzie Scott sends millions to nonprofit that supports anti-Israel and pro-Muslim groups, two of which are facing federal probes
By Sydney LakeJanuary 6, 2026
2 days ago
placeholder alt text
Personal Finance
Current price of silver as of Wednesday, January 7, 2026
By Joseph HostetlerJanuary 7, 2026
1 day ago

© 2025 Fortune Media IP Limited. All Rights Reserved. Use of this site constitutes acceptance of our Terms of Use and Privacy Policy | CA Notice at Collection and Privacy Notice | Do Not Sell/Share My Personal Information
FORTUNE is a trademark of Fortune Media IP Limited, registered in the U.S. and other countries. FORTUNE may receive compensation for some links to products and services on this website. Offers may be subject to change without notice.