Jin I-soo, the naïve heir of Hansu Group, gets into a fight with a stranger and Gang-hyun arrests him.

A model is found dead on a yacht. I-soo gets his first murder case and investigates with Gang-hyun.

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, I-soo visits his childhood home.

I-soo captures the prime suspect in the painter's case, and he learns something unexpected.

The death of an elderly is all but simple. Gang-hyun works to prove it, and I-soo seeks other methods.

A bizarre body is found in an office. I-soo and Gang-hyun start investigating the mysterious death.

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

I-soo recovers memories with hypnosis and looks for Myeong-chul. Meanwhile, an actress is found dead.

I-soo and Gang-hyun discover the actress had a stalker and was harassed by him before her death.

The sudden death of two people affiliated with Oryunhoe. Gang-hyun tries to uncover the truth.

I-soo encounters Gang-hyun at Oryunhoe, and they face a crisis of being exposed to the cult leader.

An unknown body is found in Myeong-chul's backyard amidst the election. I-soo investigates the case.

The team arrests the suspect in the case. Meanwhile, I-soo discovers secrets within the household.

The team arrests the suspect in the case. Meanwhile, I-soo discovers secrets within the household.

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