Lee Gang-Doo dreamed of becoming a soccer player, but an accident ended those dreams. His father died in the accident and he broke his leg. Lee Gang-Doo spent 3 years in rehab. Now, he doesn't have anything and just wastes his days. Lee Gang-Doo then meets Ha Moon-Soo. Ha Moon-Soo makes architecture models. Ha Moon-Soo also endured an accident that killed her younger sibling. She has suffered from guilt that she survived. She has lived her life earnestly, while suppressing her feelings. After meeting Lee Gang-Doo, Ha Moon-Soo begins to express her hidden feelings.

Set during the turbulent time of the fall of Goryeo and the founding of Joseon, two former friends face-off against one another over a woman and the future shape of the nation.

This drama is a romantic thriller that centers around a criminal profiler, Lee Hyun who previously work as a consultant at the police department in New York. After he returns to south Korea, he’s in charge of a special criminal investigation team. Due to his special insight, he can analyze the crime scene and the suspect at one glance. He works together with an elite detective, Cha Ji An to solve the crimes and they develop a romantic relationship.