Lee Mokhwa was certain that it would rain despite the weather forecast's assurance. He found himself stuck in an endless loop of December 24th, where he was accompanied by his childhood friend Choi Gyun. Although Gyun seemed to be aware of the time loop too, he refused to acknowledge it.
Mokhwa suspected that Gyun knew more than he revealed, possibly even triggering the time loop. He was determined to confront Gyun and uncover the mystery to break the cycle.