One tragic accident will change a group of friends' life in an instant. As the story goes, the origin of the watch will be untangled, the explanation for the time travel and One's own motivations for crossing into a time slip. Seven guys are all a group of close childhood friends. After the accident which caused One's parents' death, they try their best to be there for him. One will discover the secret of his father's watch and will come into a decision of turning back time to bring his parents' back to life. In the process, he gets lost beyond event horizon and witness the tragic ends that awaits the other six's lives while his friends, still on the other side are doing their best to bring him back and live through the disturbances in their own timeline. Will they manage to bring One back or they all will fail and One will become a sort of entity beyond the concept of time?