Rainie was always in the background; being the younger sister of a famous idol could do that to you. Her family never treated her the same way as her older brother, BTOB's Sungjae. A walk around her house would seem to only reveal the existance of one child, and it wasn't her. School was hard too, she was always being used by her "friends" who only befriended her to get to Sungjae. Life had lost its beauty and meaning, until Rainie met her brother's best friend, Peniel. Can he bring out the person she has hidden inside of her?