Kim Un-su (Hangul 김언수; born 1972) is a South Korean writer. He studied Korean literature at Kyung Hee University, where he also completed master's level coursework. He made his literary debut in the fall of 2002 with his short story ”Easy Writing Lessons” (참 쉽게 배우는 글짓기교실 ”Cham shipgye baeuneun geuljitgigyosil”) and in 2003 went on to win the Jinju News Writing Contest with ”Danbaljang Street” (단발장 스트리트 “Danbaljang seuteuriteu”). In 2006, ”Breaking up with Friday” (프라이데이와 결별하다 “Peuraidaewa gyeolbyeolhada”) won the Dong-a Ilbo New Writer's Contest, and his first novel The Cabinet (캐비닛 Kaebinit) won the 12th Munhakdongne Novel Award. His 2016 novel Hot Blood (뜨거운 피 Tteugeoun Pi) was awarded the 22nd Hahn Moo-Sook Literary Prize.