Jin Isoo, the naïve heir of Hansu Group, gets into a fight with a stranger and Ganghyun arrests him.

A model is found dead on a yacht. Isoo gets his first murder case and investigates with Ganghyun.

The team finds the key suspect in the model murder case. However, other suspects come to light.

A famous painter has been murdered in an art gallery. Meanwhile, Yi Soo visits his childhood home.

Yi Soo captures the prime suspect in the painter's case, and he learns something unexpected.

The death of an elderly is all but simple. Kang Hyun works to prove it, and Yi Soo seeks other methods.

A bizarre body is found in an office. Isoo and Ganghyun start investigating the mysterious death.

A man is caught at the suspect's house. Isoo investigates the link between the found item and death.

Isoo recovers memories with hypnosis and looks for Myeongchul. Meanwhile, an actress is found dead.

Isoo and Ganghyun discover the actress had a stalker and was harassed by him before her death.

The sudden death of two people affiliated with Oryunhoe. Ganghyun tries to uncover the truth.

Isoo encounters Ganghyun at Oryunhoe, and they face a crisis of being exposed to the cult leader.

An unknown body is found in Myeongchul's backyard amidst the election. Isoo investigates the case.

The team arrests the suspect in the case. Meanwhile, Isoo discovers secrets within the household.

Shocked by unexpected news, Isoo is tormented. Meanwhile, Ganghyun investigates to help Isoo.

Truths start to unfold about his mother's death. Isoo is confronted with an unbearable reality.