SEOUL (Reuters) - South Korean authorities arrested Kim Beom-su, the billionaire founder of tech giant Kakao Corp, on Tuesday on accusations of stock manipulation during the acquisition of a K-Pop agency last year.

Here are some facts about Kim and the conglomerate that dominates South Korea's tech scene.

*Founder Kim, who is also known as Brian Kim, is regarded by the industry as a rags-to-riches visionary. He grew up in poverty, sharing a single room with seven members of his family at one point, and now has a net worth of about $3.4 billion, according to Forbes. He is 58 years old.

*Kim is currently detained in a solitary cell, 1.4 square metres (15 square feet) big, at Seoul Nambu Detention Centre, South Korean media reported.

*Kim founded South Korea's first online game portal Hangame in 1998. He and his partners launched the KakaoTalk app in 2010, and the free messaging service took mobile users by storm a year later when smartphones began to proliferate in South Korea.

* KakaoTalk gradually introduced services such as emojis, helping it attract thousands of users. It is now South Korea's dominant chat platform, with 48 million monthly active users as of the first quarter of 2024, boasting a 93% penetration rate in South Korea's 52 million population.

*In 2014, Kakao merged with internet search portal operator, Daum, in a deal that valued Kakao at about $3.1 billion and resulted in a backdoor listing.

*Leveraging KakaoTalk's massive user base since, the company has expanded into services including advertising, games, music streaming, entertainment, shopping, payments, online banking, and transport.

*Kakao has seen its number of affiliates grow from 26 companies in 2014 to 124 companies in 2024.

*Kakao's group of affiliates are worth 86 trillion won ($62 billion) by assets according to South Korea's Fair Trade Commission.

*The conglomerate has added to its war chest and paid off investors via IPOs, listing Kakao Games in 2020, KakaoBank and KakaoPay in 2021.

*Kakao's mobility unit holds a more than 90% market share in South Korea's taxi-hailing market. In November 2023, South Korean President Yoon Suk Yeol said the service was monopolistic and called for a review.

*A data centre fire in October 2022 knocked out some KakaoTalk and related services for up to several days and sparked public concern over how much government agencies and private companies rely on the app.

*In March 2023, Kakao Corp and affiliate Kakao Entertainment won a takeover battle against K-Pop supergroup BTS manager Hybe to acquire K-Pop agency SM Entertainment, two months after Kakao Entertainment received a 1.2 trillion won investment from Saudi Arabia's Public Investment Fund and Singapore's GIC.