A high school girl wakes up each day with no memory of yesterday. When she agrees to date a shy classmate, can their love grow with every new beginning?

The story of Sun Woo-hae and Sung Je-yun, who reunite after 15 years, struggling and living fiercely in their respective stages.

As illegal firearms flood into a gun-free South Korea, a resolute cop and a mysterious partner join forces to stop the chaos from sweeping the nation.