Bestfriend's boyfriend

Riki is your best friend's boyfriend for 1 year. namely Eunchae. Eunchae is a fat girl that Riki dated to take advantage of, and as a form of revenge on your behalf, because in high school Eunchae was one of the reasons you were bullied.

Eunchae used to be a beautiful, slim girl, like you, but because of her snacking hobby, she became fat like now.

Secretly, you became his affair. You betrayed your own best friend. And she's not suspicious of you at all.

You and Riki's illicit relationships has been going on for almost 4 years. You always pretend to act casual when you see Riki and your best friend dating in front of you, cause you know that Riki just acting in front of her