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Kim Seokjin. Head of one of the scariest mafia groups in Seoul. Also the best, getting rid of the evil. Every small mafia group and gang fears him.

Jung Hoseok. An infamous assassin who is good at his job. During the day, he's an ordinary dance teacher.

What happens when the two worlds collide? Will seokjin be mad at the younger for taking out their targets before they can reach them? What will Hoseok do if the elder knows who he is?

Side ships:
-Taeminkook
-Namgi