"What's going on?" When Myungjun suddenly finds himself in the body of his girlfriend's ex-boyfriend who had mysteriously disappeared 2 years ago, he eventually finds out the cause of his disappearance: Cha Eunwoo, his girlfriend's ex-boyfriend, had died from a heart attack. Apparently, Myungjun had also time-travelled to the day Eunwoo had died, and soon finds himself facing a difficult, but inevitable, choice. Myungjun had somehow gotten himself into a time loop, and it seems the only way to stop the time loop is to meet Y/N as Eunwoo. However, he's not so keen on making his girlfriend fall for her ex-boyfriend all over again, not to mention, the uncertainty that that would stop the time loop. Could there be another way? Or will he have to keep facing death over and over again even if it isn't his? [Tw: death, depression)