From Jongup's perspective, Himchan seems to be everybody's boyfriend.  Why does he think of this? Because every single one of Himchan's boyfriends was related to Jongup somehow whether his cousin, his classmate, his friend, or even his teacher.  Then what happens when Himchan shows a hint of interest towards Jongup?    

"You're beautiful," were the words Baekhyun never expected to hear from anybody and definitely not from Daehyun especially after all these years they've known each other, never been friends and never been enemies either, just classmates from elementary to highschool until they chose to go to different schools for university only for their paths to cross again one day.