365: Repeat the Year S01E01 - Episode 1

Hyeong Ju, while living an ordinary detective life, loses one of his closest colleagues, which in turn takes away all his motivations to live. This is when he receives a phone call from an unknown caller telling him that he can go back a year in time as long as he is willing to do so. Hyeong Ju decides to take his chance of traveling back in time to save his colleague.