Seo Jung-jin

Seo Jung-jin (; born October 23, 1957 ) is a South Korean businessman. He is among the richest people in South Korea, with Forbes giving his December 2024 net worth as US$7.2 billion and ranking him the third richest in the country. He is chairman and cofounder of the pharmaceutical company Celltrion.

Biography He was born in Cheongju, South Korea on October 23, 1957. He graduated from . He received Bachelor of Industrial Engineering and Master of Business Administration degrees from Konkuk University. but returned as chairman in March 2023.

Personal life Seo has two sons. His first son, Seo Jin-seok , is chairman of the board at Celltrion and Celltrion Pharm. His second son, Seo Jun-suk , is Celltrion Healthcare's chairman of the board.

Seo was in a common-law relationship with a woman from 2001 to 2012. He had two daughters with this woman, although their relationship became strained and they fell out of contact. He paid child support to this woman; he alleged that she demanded more money from him, and that he filed a police report against her. In 2021, his family register was updated to include these two daughters.

Awards 2021: NAEK Award, National Academy of Engineering of Korea