Jang Dong Soo (Lee Bum Soo) is the eldest brother who works as a detective. Jang Dong Chul (Kim Jae Joong) is the second brother who is a gangster. Meanwhile, Jang Dong Woo (Im Si Wan) is the maknae brother who was adopted by a rich family when he was a baby.

When three brothers were very young, they lost their parents. The three brothers were then separated and lived apart for 20 years without knowing of each other. They then meet again unexpectedly and begin their relationship as brothers.

Hwang Shin Hye (Oh Yun Soo) is Jang Dong Soo’s love interest and Oh Jung Hee (Baek Jin Hee) is a woman who has the love of another two brothers.