The serial killer kidnaps Na Young. Her life is in danger. All the clues in her kidnapping are the same as the incident that happened in 2018, but this time, Han Tae Joo won't let him get away. Na Young has been missing for over nine hours, and the detectives are put to the test to save her life. Will they find her in time?

Han Tae Joo still remains in the year 1988 even after the serial murder case of Kim Hyun Seok concludes. For their role and duty, the detectives of the Seobu Police Department are ironically faced with a transfer. Captain Kang Dong Cheol is outraged by this, and he seeks to find out answers only to find himself in trouble. Meanwhile, Han Tae Joo receives a call that might help him find his way back home.

Captain Kang Dong Cheol is a suspect in the death of Officer Shin and Chief Kim Gyeong Se. As a fugitive, he can only rely on Han Tae Joo to prove his innocence. Despite the evidence all pointing to Captain Kang, Han Tae Joo still tries to help him. Meanwhile, Chief Ahn Min Sik is determined to arrest Captain Kang Dong Cheol and won't let off one bit.