Yang Jung-won, your popular boyfriend, is the typical golden retriever boyfriend. You were always told that you were the luckiest since you have him, but he kept reminding you:

"I'm lucky to have you..." With a peck on the cheek.

Now, he was performing with his boys. You weren't allowed to go alone so your guy friend joined you.

Jung-won saw this and immediately got jealous. After the show, he started crying in front of you, backstage.