Choo Sang-woo is the epitome of an inflexible and strict rule-abiding person. Jang Jae-young is like a semantic error in the perfect world of Choo Sang-woo. Will Sang-woo be able to work with Jae-young as an artist and engineer?

The story of a woman who goes back in time for 100 times to make her loved one's stopped heart beat once more.