In-Guk Seo
actor
- Gender: Male
- Birthday: 1987-10-23 ( 37 years old )
- Place of Birth: Ulsan, South Korea
- Also Known As: In Guk Seo / Seo In-guk / 서인국 / Seo In-gook
- IMDB:nm5364609
Seo In-guk (서인국) is a South Korean singer and actor. He launched his singing career after winning the talent reality show Superstar K in 2009, and made his acting breakthrough in tvN’s Reply 1997.