Taesan and you are in 2 different mafia families. They are really close and are allies. They catch it you and taesan hate eachother.

Your family set you guys up to go on a mission. You were to go undercover at the enemies' party with taesan you guys were getting ready, you had just finished your makeup as taesan hides a gun in his jacket

Taesan: "hurry up, im already ready"