Help to find a psychological horror story

Im trying to find this psychological horror story i read a few years back. Its a webtoon about korea's education and its psychological impact on the main character. His parents are divorced and he lives with his dad, who is super strict with his education and tends to view his son is stupid and calls him "slower than most kids" or smt idk
Throughout the story he meets these two kids, a boy and a girl. The guy wants to help him, convincing him to live with him i think??????? Mc also tried finding his mom at one point, only to discover shes remarried with a child. In the end the mc dies

Idk idk IDKK if thats enough description but i hope someone knows what im talking about THANK YOU!!!