Mon, Nov 4, 2019
Ji Seok makes up his mind to kick Ryung out of the Subway Police for taking investigations into her own hands all the time. However, Ryung is attacked while out on an investigation by herself and there is something weird about the man who seems to be following her. Meanwhile, the Wangsoori Subway Police get dressed up to go out on Club Day, the best day to boost their arrest records.
Tue, Oct 29, 2019
Ryung and Ji Seok save Choi Do Chul just in time. Throughout their investigation, Ji Seok miraculously learns to appreciate Ryung's over-the-top nature. Meanwhile, a star professional fighter becomes the PR Ambassador for the Subway Police. By chance, Ryung comes across his dirty secret and the Wangsoori Subway Police finally get a lead on the Grasshoppers.
Mon, Nov 18, 2019
The kidnapped boy is rescued in the nick of time, but the grasshoppers slip away. Ji Suk gets Ryung back to his team. Ryung finds about about Ji Suk's mother's situation and Ji Suk suspects she has a situation with a family member. The teams get closer to the Subway Ghost just as a former subway police member is in danger.
Tue, Nov 19, 2019
Ji Suk and Ma-Ri find out about their partners' secret collaboration and feel betrayed. The Subway Ghost's lair is revealed and information about Ryung's sister's disappearance start coming to light. The secret investigation against the rules has consequences for Ji Suk. The Subway Ghost may have a connection to someone close to Ji Suk's mother.
Mon, Dec 9, 2019
Ryung and Ji Suk make their way into Kyung Hee's house and find a room that looks like a young girl's. After sharing the new evidence with Ma Ri and her team, they split up into two groups to chase both Kyung Hee and Yi Joon. Meanwhile, Ryung's hopes of finding Jin alive begin to grow and Ji Suk gets a call from the hospital about his mom.
Mon, Oct 28, 2019
Ryung and Ji Seok attend the disciplinary committee hearing and return to the station for night duty. Thanks to Ji Seok's martial arts demonstration and a pot of noodles, Ryung gets her hands on the screen door keys once more. Meanwhile, an ordinary father, whose livelihood takes place on the subway, goes missing.
Tue, Dec 10, 2019
Finally, Ryung and the Subway Ghost come face to face. As his rage explodes, the Subway Ghost attacks Ryung, but another tragedy puts a stop to his actions in the end. Meanwhile, Jin appears at the scene, only to run away amidst the chaos. Ryung, the Subway Police, and Ma Ri's team put in all their efforts into reuniting the twin sisters.
Tue, Nov 12, 2019
Ma Ri leaves Ryung after saying harsh words that keep replaying in Ryung's mind. Still, Ryung continues her search for the Subway Ghost. But this time, she comes across someone willing to help. Meanwhile, an autistic boy goes missing from the bakery in Wangsoori Station and the Grasshoppers are on a pickpocketing spree once again. Ji Seok and Ryung have different priorities in which case to pursue.
Mon, Nov 25, 2019
The police make headway on the Subway Serial Murders and narrow down the suspect list. After getting a tip about the identity of one of the Grasshoppers, Ryung and the Metropolitan Detective Division chase him down as he might be the Subway Ghost. Meanwhile, Ji Suk's investigative instincts start acting up again, despite his suspension. Ji Suk finds out Ryung's secret and it brings them closer together.
Tue, Dec 3, 2019
The police believe the Subway Ghost is in a mental hospital and that he plans to commit another murder. They chase him down and search the entire hospital building. Amid the chaos, Ji Suk's mom and her caretaker are nowhere to be found. The Subway Ghost leaves behind a video clip, revealing himself and the shocking truth.