This film tells about the twists and turns of the lives of four lovers who must each overcome different fears and problems as they face the beginning of a new year. The four pairs consist of Ji Ho and Hyo Young, Jae Heon and Jin Ah, Yong Chan and Yao Lin, and Rae Hwan and Oh Wol.

Soo-hyun comes across magical pills that allow him to go back and forth in time. 30 years to the past, young Soo-hyun meets future Soo-hyun and learns that his girlfriend will soon die because of him. In order to save her, the two Soo-hyuns try to change the past together, but a completely new and unexpected past is formed that leads to a new future.

Ordinary university student Min-Jae meets expert bank thief Suk-Goo. Min-Jae soon works Suk-Goo and his fraud team. Their heists go well, but they don't trust each other.

A con man who had been reported dead after committing a historical fraud case is rumored to be alive. Prosecutor Park who was in collusion with the con man needs to eliminate him to avoid a corruption scandal. During his pursuit of the con man, he meets Ji-sung who is also after the same man for a personal revenge. Realizing their mutual goals, they decide to team up, but with hidden motives.