Shark - His whole family is awefully wronged by the rich family of the girl he loved... he will come back and make them all pay back. But can he also punish the girl he once loved?
Bad Guy - when he was young a rich family took him away from his parents because they said he is an illegitimate child of this rich family. But they find another child and kick him out after he already lost everything. He planed his revange over years. He enter their lives as a con-man and let them destroy themselves.
I Miss You - three child's experience horrible things. One of them will lead a nearly normal life and one of them just survive and try to live on and one of them will come back later in order to take revenge without mercy. But what happens when they all three meet again? (I cried so much during the first 6 episodes)