Episodes
1. Code ZEROOn his first day, Detective Jin Ho-gae works jointly with firefighters to resolve a kidnapping case.
2. Code TWOThe first responders try to stop a suicide attempt, but the case turns out to be more complicated.
3. Code YELLOWHo-gae's house is said to be haunted. He and Do-jin try to solve the mystery that lies in the ashes.
4. Code V30A driver is arrested after a hit-and-run accident of a child. A shocking truth awaits.
5. Code BLACKHo-gae starts an undercover operation. He must stop a crisis that may result in mass casualties.
6. Code REDAn unidentified body is found at the scene of a fire. An unlikely person is held as a suspect.
7. Code BLUEHo-gae identifies a new suspect, while the case becomes evermore ensnared in mystery.
8. Code CLEARHo-gae reinvestigates a murder case and gets help from Song Seol and Yoon Hong.
9. Code PINKFirefighters rush to save a teenage girl attempting suicide. Police find a body of a newborn baby.
10. Code AMBERThe first responders search for the father of the stillborn child. They then meet a strange patient.
11. Code ONEHo-gae misses Hyun-seo by a second. He and Seol pursue the evasive kidnapper.
12. Code F63.1A series of fire incidents occur. Do-jin suspects a chain arson and goes to see Ho-gae.
