Kim Hyeong-won

Jaeseong, who was just a close older brother for a long time. As soon as he revealed the news of his enlistment, Mingyu feels strange. When the puzzle of emotions, which was subtle, is woven under the reason that "I like him," Mingyu confesses to him. Actually, the subtlety that Mingyu felt was Jaeseong's. The two check each other's minds.

Min-gyu and Jae-seong are best friends. When Jae-seong tells Min-gyu that he is going to the military, Min-gyu is surprised and realizes this may be his last chance to confess his true feelings.