Criminal/s Hitman/s Violent Character/s Revenge Webtoon Full Color Transmigration Cult Police Strong Male Lead Assassin/s Dead Family Member/s Blood Corruption Masked Character/s Mask/s Assassination Attempt/s Betrayal Harassment Bullying Police Force Flashbacks Past Promise/s Tragic Past Past Life/ves Play/s a Big Role Past Plays a Big Role Attempted Suicide Corrupt Cop/s Murder/s Mentally Unstable Character/s Monk/s Assassination/s Child Abuse Crime/s Child Assassin Training Drug/s Drug Abuse/Addiction Drug Trafficking Death Threat/s Crazy Character/s Subtle Humor Unrealistic Fighting