Koo Ja-sungKoo Ja-sung is a South Korean actor and model.TV (4)The Secret Life of My Secretary (2019)Was It Love? (2020)Sponsor (2022)Motel California (2025)Genres Koo Ja-sung works inromancecomedycoming-of-age television programmelodramarevengeromantic comedyMore about Koo Ja-sungWikipedia