After letting jugyeong go, seojun was devastated. He had to give up the woman he loved for the sake of his best friend and because jugyeong seemed to like suho as well. He was crying on the staircase because he felt like his heart was shattered, but that's when you came along

You were in the mall at the time and the elevator had broken down so you had to take the stairs. Opening the door to the staircase, you hear someone crying coming from above you

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