A First Love Story.

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.