Ko Sung-hee (Hangul: 고성희; born June 21, 1990) is a South Korean actress. She is best known for her leading roles in Diary of a Night Watchman (2014) and My Holo Love (2020). She has also starred in While You Were Sleeping (2017) and Mother (2018).
Known For:Acting
Birthday:1990-06-21
Place of Birth: United States
Also Known As:Go Sung-hee, 고성희, Ko Sung Hee, Go Sung Hee, 高圣熙, 高胜熙, コ・ソンヒ