Zhehan accidentally traveled through time and was bound to a "rescue mission" with the goal of allowing the cold and alienated male protagonist Genghan to retrieve his lost past memories. Entering a strange time and space for the first time, she deliberately approaches with a mission, but in repeated confrontations, her deliberateness fades away and she becomes sincere. As a business tycoon, Genghan is full of thorns and is wary of Zhehan who suddenly breaks in, but he can't help but be attracted by her freshness and persistence.
During the mission, the bonds of the past gradually emerged. They discovered that this time travel was never accidental, and the mission was not just about rescue. Zhehan struggles between completing the task and holding on to his heartbeat, while Genghan sinks in cold wariness and unconscious preference.
When the mission came to an end and their memories returned, they realized that this encounter across time and space had always been a two-way journey. This belated heartbeat had long been engraved in fate, and it had nothing to do with the mission, but only for each other.
