Gapdong - psychopathic serial killer
I Remember You - serial killer who escaped prison and is on the loose even after several years
Tunnel - mc travels to the future and tries to find serial killer
The Girl Who Sees Scents - mc tries to find evidence to arrest serial killer
Strong Woman Do Bong Soon - attempts to find and arrest serial killer
Special Affairs Team TEN - tries to find serial killer
Special Affairs Team TEN 2 - tries to find the right serial killer
Detective/Action/Mystery Investigation Dramas:
Defendant - mc has memory loss problem and wakes up in prison - tries to find out how he got into prison
Signal - communication with detective from the past surrounding the same case
Cheo Yong - mc able to see demons and ghosts and solves bloody crimes
Cheo Yong 2 - ^^
Remember - mc is lawyer trying to help his father who was framed for rape and murder, mc has memory problems
Healer - mc is an illegal mercenary taking lowkey jobs for money, skilled in fighting
The K2 - mc is an agent working with political figures, skilled in fighting
Blood - case surrounding the origin of vampires and investigation of the murder of mc's family
Kill Me, Heal Me - mc has multiple personality disorder
You're All Surrounded - detective drama
Yongpal - mc is a mercenary doctor
I love detective mystery dramas