Jin Isoo, the naïve heir of Hansu Group, gets into a fight with a stranger; 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; Isoo visits his childhood home.
Isoo goes to find the prime suspect on his own; after a struggle, he's able to make the arrest; however, he learns an unexpected truth just when he thought he had caught the culprit.
The team is investigating an elderly person's death in their new case, but they struggle to find a suspect; the investigation makes little progress until Isoo learns new facts from the victim's family, and he sets out to find the culprit.
Ahn Bo-hyun
Jin Isoo
Park Ji-hyun
Lee Gang-hyeon
Kwak Si-yang
Jin Seung-ju
Kang Sang-jun
Bak Jun-yeong
Kim Shin-bi
Choe Gyeong-jin