"How would you feel about a little sister?"

Kim Kina (13), had lost everything she had ever care for in life. After her mother's death, her father also went missing. Kina has to live and fend for herself, but could a little girl do that? Even the stubborn child herself doubts that. The only way that the little girl would survive, is to turn to the person that had ruined her life; her own Kim family.

SHINee's Kim Kibum – Key (19), born from a wealthy family and now a shining worldwide star, was living his life peacefully––until he figured out he had a younger half-sister. Kibum was unaware of the fact that they are siblings of one blood. The unexpected meeting led to an unexpected reaction, which behind it was an unexpected explanation.

When those unexpected events ended up with Kina having nowhere to go, Kibum's brotherly instincts got the best of him. He had to take care of her, she is his only sister after all. There was nowhere for Kina to go, except... her brother's dwelling––the SHINee dorm.

And so, Kina was forced to live with four strangers with different personalities, plus his naggy, annoying older half-brother. Striving to be invisible from the media while helping Kina grow up, how far would a brother go for his little sister?