​Dakyung, a YouTuber named Mystery Commando, is an otaku who tells true-life horror stories on the web.
However, she recently lost most of her subscribers due to a video manipulation controversy and lost her reputation within her creative agency. To recover her reputation and fame, she must find a powerful horror story!
One day, Woojin, her agency producer and only supporter, introduced the station master of Gwangjin station, where mysterious things are happening. The stationmaster begins to recount a series of mysterious incidents that occurred on the subway for real.
Once again, her video gets a lot of ‘subscriptions and likes’ as subscribers testify to their own strange experiences at Gwangjin Station. However, due to a sudden manipulation controversy, Dakyung is in a crisis of losing everything again. However, the stationmaster who could prove her innocence has disappeared without a trace. She decides to follow his trace no matter what without knowing where the journey would take her to….