For anyone confused: This is the past. In the present time Dawoon had said that him and Seojin have been friends for 6 years. So Dawoon has had a one-aided crush for 6 years. The past is explaining the start of their friendship and how Dawoon fell in love before the present time (college students) continues. Also, the one who is speaking at the end is Seojin and not Dawoon. Seojin realized that Dawoon is avoiding him (he didn't let him touch his hair and when he had his arm around him, Dawoon sneakily pushed him off)