I found myself enjoying this thriller more than I expected. It’s true that it doesn’t reach a high level of quality and the acting isn't particularly impressive, however, the narrative held my interest for a good portion of the time. "Na-yeong" (played by Bo-ra Kim) is working toward becoming a journalist when she gets an unusual lead from a friend at a train station. “U-won” (Jae Hyun Kim) believes that the death of a child found between the rails was shrouded in mystery. Even though her editor has concerns, she connects with the child’s family and uncovers what seems to be dark and disturbing secrets connected to the station's history. The pair resolve to investigate this past and bring those secrets to light, no matter who might be affected! It moves along at a brisk pace, but it would have benefited from more skilled performers. The special effects and sound design are acceptable and the story is well-constructed in an unsettling way, offering some unexpected developments that place it somewhere near standard Blumhouse horror films. I doubt I’ll recall it after watching, but it's far from being a bad experience.

Source on TMDB