The eccentric Oh Hyun Jae was a peerless criminal profiler until a bomb planted by a serial killer took the life of his young fiancée, causing him to become a recluse. When a serial killer long thought dead returns to terrorize the city, rising star of the police, Hwang Hwa Young, resolves to outwit the killer. To do so, she teams up with both Oh and the remarkable rookie cop Cha Soo Young, whose photographic memory may prove to be a powerful crime-fighting weapon.

Disguised under the shadows of a mask, a crew of desperados band together under the leadership of a criminal mastermind known only as “The Professor” to pull off the biggest heist Korea has ever seen.

Needing funds to study art abroad, Gong Shim rents out her rooftop room to a pro bono lawyer, who begins shaking up her otherwise dispiriting life.