Jeongin was abandoned on the street when he was five months old. Some say his mother didn't want him because she got pregnant at a young age or because they simply didn't want to have children.

Nowadays Jeongin is your boyfriend, he is often insecure due to his difficult childhood. He was adopted once but it didn't work out because the family was abusive, so he returned to the orphanage, Even though he is adopted and has a family, he still has this insecurity.