[3] Seo debuted in 1994 ln play Hwang Gu-do.
[2] Seo appeared on talk show Radio Star thrice in year 2015, 2017 and 2019 in episodes 426, 513 and 648 respectively.
[4][5] In 2021 he appeared in tvN's apocalyptic thriller Happiness along with his wife Jung Jae-eun.
[6] In 2022 Seo was cast in JTBC TV series Thirty-Nine as father of one of the main leads.
[7] Seo married actress Jung Jae-eun after 2 years of dating at the age of 45.