Read Do You Believe Humans Are Born Evil? manhwa on 9manga

Chae Seon-ho, who is poor but living an honest life, is worried about the semen that has been on his cabinet for several months. As the frequency of vicious pranks increases, he and his best friend Lee Yu-geon stay in front of the cabinet all night to catch the criminal. Seon-ho goes to the bathroom to wake up from his drowsiness and feels uncomfortable in his lower body.