This particular tale began on a rainy day in May as Sungyeol arrives at the boarding platform, his bag strung over his shoulder and ticket tucked safely in his suit pocket. Onboard he meets his seatmate, another businessman like himself known as Myungsoo. Yet before the train arrives safely at its end point passengers begin to go missing without a trace. Now it’s up to Sungyeol to solve this mystery before he’s the next victim.