S1 E1 • Job Interview & Audition

The Subway Police of Wangsoori Station is led by Chief Inspector Ko Ji Seok. He is the best of the best, although his only goal in life is to have a stable, uneventful career. However, a serial killer, nicknamed “the Subway Ghost”, strikes the Subway Police 30 Year Anniversary event. An applicant shows up for a job interview to join the team.

Première diffusion : 21 octobre 2019

S1 E2 • Going Home to Family

Ryung officially becomes a member of the Wangsoori Subway Police and Ji Seok’s partner. Ryung gets into trouble from the start, because she sneaks into the tunnels. Meanwhile, an elderly man who delivers packages via subway becomes the victim of an assault. Ji Seok realizes that the package is related to criminal activities. While Ji Seok wants to hand the case over, Ryung acts before she thinks, as always.

Première diffusion : 22 octobre 2019

S1 E3 • Disciplinary Hearing

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.

Première diffusion : 28 octobre 2019

S1 E4 • Tracking Down the Grasshoppers

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.

Première diffusion : 29 octobre 2019

S1 E5 • Club Day

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.

Première diffusion : 4 novembre 2019

S1 E6 • A Petty Thief?

A rumor circulates about people disappearing after they party all night on Club Day, then taking the first train home. Ryung and Ji Seok get on the first train to find out whether the rumor is true.

Première diffusion : 5 novembre 2019

S1 E7 • Jealousy & Confusion

Subway Police and the Metropolitan Detective Division come together for a joint investigation. Despite Ji Seok’s jealousy, the joint investigation team switch partners. Ji Seok and Ma Ri become one team, while Ryung and Woo Hyuk become another. Meanwhile, Ji Seok decides to let Ryung transfer to a different team. As Ma Ri approaches him again, Ji Seok feels confused.

Première diffusion : 11 novembre 2019

S1 E8 • Facing the Harsh Truth

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.

Première diffusion : 12 novembre 2019

S1 E9 • Getting Closer to the Subway Ghost

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.

Première diffusion : 18 novembre 2019

S1 E10 • The Hideout

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.

Première diffusion : 19 novembre 2019

S1 E11 • Going After the Grasshoppers

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 Seok’s investigative instincts start acting up again, despite his suspension.

Première diffusion : 25 novembre 2019

S1 E12 • The One That Got Away

One of the Grasshoppers gets away from the police. The other two Grasshoppers confess that they only know him as Han Tae Woong, although that name turns out to be a fake identity. The investigation reaches a dead end and Ji Seok is about to be reassigned to a remote island. Ryung comes up with a plan to save Ji Seok and to catch the Subway Ghost.

Première diffusion : 26 novembre 2019

S1 E13 • The Grasshoppers Are Behind Bars

Ji Seok and Ryung catch the remaining Grasshopper who everyone believes is the Subway Ghost. However, while being interrogated, the Captain of the Grasshoppers makes a shocking statement. The truth about the Subway Serial Murder Case finally begins to reveal itself and Ryung is hopeful that she may find out what happened to her sister.

Première diffusion : 2 décembre 2019

S1 E14 • The Subway Ghost Reveals Himself

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 Seok’s mom and her caretaker are nowhere to be found. The Subway Ghost leaves behind a video clip, revealing himself and the shocking truth.

Première diffusion : 3 décembre 2019

S1 E15 • The Subway Ghost’s Method

Première diffusion : 9 décembre 2019

S1 E16 • Finally Catching The Subway Ghost

Première diffusion : 10 décembre 2019