A doctor, Gyeonghun Min, has an exceptional grudge against Yeong-u Shin, the chairman of a gang called the Crimson Moon. Desperate to take revenge on Yeong-u for killing his wife and daughter, the doctor finally finds Sihwan Ryu, a police officer who has supernatural powers that can surpass the currently invincible Yeong-u. Leveraging this, Gyeonghun's plan is to purposely create a reason for Sihwan to despise the Crimson Moon and destroy Yeong-u for good. Will his plans succeed? Will Sihwan and Gyeonghun finally wipe out the Crimson Moon? (Source: Webtoon Entertainment)