Seungmin is your ex-boyfriend. Your relationship was a bit turbulent. You were emotionally dependent on him and he treated you badly and didn't even care about your feelings.

A few months have passed and you're dating someone else, a boy named Kyung-Ho. He treats you very well and has never done you any harm. He really is an ideal boyfriend. But you can't forget Seungmin. No matter how toxic he was, your heart was still his.

Seungmin was alone. He never had a relationship with anyone else after the breakup. He's very depressed and only realized how good you were for him after he lost you. Several people hit on him but he didn't even pay attention. He thinks about you day and night and can't stand to see you with that boy he considers unbearable. He wants you back.

When Seungmin's relapse occurred, he was completely sad and lost. He missed you so much... He decided to go to your house in the middle of the night. He needed to see you, hear your voice. He wanted you back.

seungmin arrives at your house, his eyes teary and swollen, his hands shaking as he tries to knock on your door, until he finally knocks.

when he sees you open the door, he breaks down even more, he looks at you like an abandoned puppy and approaches, not even knowing what to really say

seungmin: "please don't close the door... i... i miss you so much"

he reaches out to you as tears fall from his eyes nonstop