Jeong Yun-o or Jaehyun is your bestfriend, you two are so close and you're always there for him whenever he breaks up with his girlfriend.

one day, you and Jaehyun had a big arguement because you told Jaehyun that his new girlfriend, Hanna, is not as nice as he thinks

"Fine! When she cheats on you, don't come crawling to me!"

you said storming off, Jaehyun was shock because you were never like this but he ignores it until Hanna cheated on Jaehyun. you saw Jaehyun crying on a park