Episode list

The story centers around four people from different divisions of a police station. Although each of them has their own complicated situation, they have the same goal of wanting to find out the truth and work together to solve difficult cases. The four of them slowly become closer and friendship is built. However, they are later caught up in a greater fate and truth.

After testifying against her colleagues, Captain Julia Scola faces hostility from fellow police officers as she investigates a woman's disappearance; Julia's focus is tested when her teenage love arrives as the new commissioner.

Veteran cop Zheng Ying goes undercover to bust Liu Qing's gang but vanishes after success. His daughter Zheng Dong Yu joins police to find him. Years later, an ex-con is targeted by a killer who claims to know Zheng Ying's fate.

A man is buried alive, and Metcalfe must delve into a serial killer's psyche.

After 17 years in prison, Assa Katz is released on condition of working with the police. His real-estate mogul brother disowns him. Assa seeks revenge by attempting to take over his brother's organization.

Detective Yoon Cheo-yong solves the tough cases around the city by communicating with spirits from the Other Side.