The Lost and Found Division, along with the other sections, go on a team building retreat in the countryside. Si Ohn encounters the ghost of Lee Hyung Joon, but keeps his presence a secret from Gun Woo.
Hyung Joon enlists the help of Hee Bin to get a message to Si Ohn, because only Hee Bin can hear him. Si Ohn finds a new lead that can help her recover her lost memories.
When the sky begins raining blood, Si Ohn is led to a new case involving Korean-Chinese immigrants and Hyung Joon. She and Gun Woo must grapple with the consequences of their kiss.
Si Ohn regains most of her memory, and realizes that her enemy is Choi Moon Shik. Gun Woo stays with the Lost and Found team to help Si Ohn with her case, even though he knows she doesn't care for him.