Lee Chan Suk is a cautious and intelligent law-inforcement agent who is in pursuit of crime suspect Kang Hyun Gee. Hyun Gee's biological sister, Han Sae Jin, was raised as an only child by her weathly adopted family. At first, Chan Suk uses Sae Jin as bait to capture Hyun Gee, but over time he begins to fall for her pure heart.