A choice leads the world to divide into two, and a detective gets into the case to solve the mystery.
EPISODE 1
A Closed Down Station and a Skeleton
Dead bodies in skeleton form are found in closed down Mugyeong Station. Do-won is on the case.
EPISODE 2
Episode 2
Seo-kyung finds the keepsakes that were gone 12 years ago at a murder scene in the skeleton.
EPISODE 3
A Reversible Death
Seo-kyung is murdered by the Mugyeong Station killer. Do-won sees someone unexpected at the station.
EPISODE 4
Episode 4
Do-won goes to World B and meets Seo-kyung. He's being chased as the suspect of a murder case.
EPISODE 5
Life and Death Crisscrossed
Do-won A starts looking for victims of World A in World B, then has an unexpected encounter.
EPISODE 6
Episode 6
Do-won and Seo-kyung B are at odds over Kim Jin-woo, the suspect of the missing person case.
Yoon Shi-yoon
Kyung Soo-jin
Shin So-yul
Lee Hang-na
Nam Mun-cheol
Jo Wan-gi
Kim Dong-young
Yoon Bok-In
Cha Yub
Ryu Seung-jin
Park Ga-yeon