Train

S1 E1 • 58m • HD15

When the police discover skeletons on the train tracks at Mukyeong Station, Detective Do-won heads there while chasing a key suspect.

S1 E2 • 65m • HD15

Do-won confesses that his father killed Seo-kyung's father. Later, Seo-kyung discovers her mother's jewellery on the recently-discovered bodies.

S1 E3 • 60m • HD15

Seo-kyung dies at the hands of the Mukyeong serial killer. Do-won realises that the killer is the same culprit as from the murder case 12 years ago.

S1 E4 • 57m • HD15

Do-won arrives in World B and meets the Seo-kyung of this world. He discovers the other Do-won is on the run as a prime suspect in a murder.

S1 E5 • 56m • HD15

The Seo-kyung of World B transfers to Mukyeong Police Station. Do-won of World A starts his search for the victims of his last case.

S1 E6 • 58m • HD15

Jin-woo is the prime suspect in World B, and Do-won tries to figure out what has happened. Seo-kyung seems to have a dark past in World B.

S1 E7 • 58m • HD15

Do-won finds traces of the killer on the body of Jo Young-ran. Seo-kyung and Do-won begin tracking the culprit of the 12-year-old case once again.

S1 E8 • 61m • HD15

As they investigate Sung-wook's past, Do-won and Seo-kyung find themselves at another dead end. Meanwhile, the two Do-wons meet face to face.

S1 E9 • 60m • HD15

Jae-chul and Do-won of World B die in a mysterious car accident, and Seo-kyung finds out that the living Do-won is from another world.

S1 E10 • 59m • HD15

Do-won finds out who the real killer is. However, the killer is one step ahead of everyone else.

S1 E11 • 58m • HD15

After getting shot by his suspect, Do-won returns back to his world. In World B, Seo-kyung discovers an unexpected clue.

S1 E12 • 61m • HD15

Do-won saves Mi-sook, but she points a gun at Seo-kyung. Thinking he keeps on putting Seo-kyung in danger, Do-won makes a difficult decision.