This was a drama i watched long ago, but just remembered the feeling, It may differ in quality overall, but up until ep. 4 of Death's Game they have a similar history.
Well, I thought both dramas are kinda similar and have almost the same vibes. In both the main leads are facing relationship problems and are sent back in time for a mission.^^
In both titles in the foundation is a love story, also in both main characters are members of band. The main is that guys tries to change tragic fate of their sweethearts by returning through time. The difference is that one returns intentionally and the other not arbitrary.
Though not the main focus of this drama, the female lead went through similar experiences and developed the same way before meeting the male lead who helps them become happy. Both have a good look on life and development.