Dangerous dark alleys, the bright jazz of the city, and the exhilarating fight for survival each and every day. These are what Jang Dongwoo loves about his home in Seoul. Born off the streets, he's been alone since day one, having to fend for himself and learn life lessons the hard way. He always lived by the number one rule that you are your own best friend.

But his solo life is interrupted by a girl, Kim Jin Ju, a girl seemingly alone like himself who just wants companionship, more specifically his. Instead of rejecting her like any other person who threatens his privacy, he accepts his new friend, albeit reluctantly, and finds being with Jin Ju isn't so bad after all. Even when her presence drags him into trouble with notorious gangs like fearsome Infinite, and infamous SHINee, of which one member is her long lost brother, and other romance dilemas, he'd rather have her stay by her side then go back to the unfamiliar lonliness he had once become accustomed to.