“I would like to go back in time one year. I lost someone important to me then.” That’s what workaholic Eunkyeol Jung wishes one Christmas at a mysterious bar, as she laments being dumped by her boyfriend a year ago. And against all odds… her wish comes true! Unfortunately, she still gets dumped, but this time around she saves her best friend’s brother Yiyool from a tragic death. He even becomes her coworker! With this time to do over and without the love life she hoped for, will Eunkyeol find unexpected happiness or another year of heartbreak?