based on novel or book,blackmail,trauma,gangster,investigation,gang leader,high school,secret love,revenge,unrequited love,organized crime,gang,heartbreak,first love,undercover operation,living alone,older man younger man relationship,hidden identity,young adult,manslaughter,cohabitation,gay romance,unconditional love,abandonment issues,gay relationship,age-gap relationship,secret crush,lovers separated,boys' love (bl),part-time worker,meet again,family pressure,lovers reunited,closeted,strangers to lovers,dramatic,witty,romantic,second chance romance,height difference,poor man rich man,multiple couples,fake amnesia,flashback to past,supportive sibling,cold man/warm man,half-brothers,high school to working life