Park Hae Young, now a police officer, connects via walkie-talkie with Detective Lee Jae Han in the past, solving murders.
Baek Hee Sung hides dark secrets from his wife, a detective investigating a close psychopath.
Three high school students resort to crime to fund their college education, facing unexpected dangers.
Jong Woo relocates to Seoul for a job and experiences mysterious occurrences while living in a cheap hostel.
Cha Dal Gun and NIS agent Go Hae Ri join forces to uncover a government scandal after a plane crash.
In Joseon era, a deceased king's spirit returns, an illness spreads, and the crown prince faces a new threat.
Yoon Ji Woo infiltrates the police as a mole in the drug unit to investigate her father's disappearance.
Detective Park Kwang Ho time travels from 1986 to present-day Seoul, partnering with Kim Sun Jae to catch a serial killer and return.
Sang Mi and her family encounter a cult in Mujigun, and four young men strive to rescue her.