Kaori got pregnant at 17 with Kim Seokjin baby. But was in a complicated relationship with Kim Namjoon. She gave up the baby for Namjoon, and Jin took care of the child himself. She still watch over her, but couldn't tell her she is her mother. Without the support of their friends they wouldn't have be able to take care of Koari or the baby. But when the child was 12 she found out who her mother really is...