OCN's "Train" is a sci-fi mystery drama that involves a parallel universe, wherein one choice made during a murder split the world into two. An eminent detective named Seo Do Won (Yoon Shi Yoon) gets involved in one serial case to protect the girl that he loves.
OCN shared two relationship charts for each universe: one is "A" and the other one is "B." In universe "A," Seo Do Won is a high-ranking detective and the leader of the violent crimes division. While chasing an offender, Seo Do Won meets Han Seo Kyung from the other universe and starts living the life of his doppelganger. This leads Seo Do Won to begin a journey in finding out the truth.
On the other hand, Seo Do Won in universe "B" is not so different from Seo Do Won in universe "A" in terms of occupation, name, and physical attributes. However, Seo Do Won leads a life of corruption in universe "B." Despite his position as a high-ranking detective, he is now a suspect in a murder case of a drug broker.
Kyung Soo Jin will portray the role of Han Seo Kyung, who is, in universe "A," a blunt and honest prosecutor and a detective with a cold personality in universe "B." Han Seo Kyung is described as a woman who is successful because of love. She lost her father twelve years ago in a murder incident and was left with no one to take care of her. But Seo Do Won took her in like she was family and helped her live with a brighter future. Later on, Han Seo Kyung finds out about what really happened in her father's death, leading her to embark on a journey to a new mystery.
Han Seo Kyung in universe "B" is someone who goes through the problems of life because of hatred. She is described by her colleagues as a malicious and psychotic detective. The only goal that she instills in her mind is revenge to the person who killed her father.
In terms of the character's relationships with each other, in universe "A," Han Seo Kyung and Seo Do Won have a romantic relationship. They have Lee Sung Wook and Jo Young Ran, Han Seo Kyung's half-brother and stepmom, as enemies.
Seo Jae Chul is Seo Do Won's father, who is known to be the reason for Han Kyu Tae's death, Han Seo Kyung's father. Oh Mi Sook works as the section chief, who sees Seo Won Do and Han Seo Kyung as family. Seo Do Won and Han Seo Kyung are also friends with a forensic investigator named Lee Jung Min.
In universe "B," Seo Do Won has a mutually hateful relationship with Han Seo Kyung. Han Seo Kyung still hates him and his father, and she abhors stepbrother and stepmother in this world. Oh Mi Sook has no special relationship with Seo Do Won, and he is only his boss, and Lee Jung Min was his past lover.
Catch the premiere of "Train" on July 11, and make sure to watch the teasers below!
