Son Hyunwoo : 2 years older than Seungwan, sometimes like an angel but everytime like an evil, prankster, but love his little sister.

Son Seungwan: Maknae, prankster more than Hyunwoo, Hyunwoo's maid, always cooking for her brother.

The Son's Family consist with Hyunwoo and Seungwan. They live together in a big house, just two of them. Their parents are live in U.K for their business.