Jungkook falls in loves with Seojin. Seojin mysteriously disappears one day. A year later, Jungkook sees Seokjin and thinks that he is Seojin. Seokjin tells him he does not know him, making him heartbroken. Jungkook doesn't believe Seokjin and bothers him. The two fall in love. Yet, Seokjin doesn't want to fall in love since he thinks Jungkook loves Seojin, not him.