Would you trade your poor but loving family for a life of riches? When Seung Cheon gets his hands on a magical spoon that allows him to switch lives with his rich best friend, he thinks it’s a no-brainer. But life-altering decisions are always accompanied by a sense of doubt, and with only three chances to change his mind, Seung Cheon has to decide which of his two possible futures is worth keeping.

While unraveling an enigmatic murder mystery, a special force leader realizes this case is related to the incident that took 28 years ago in a small town.

Can a woman who can’t remember her past and a man who is trying to hide his true identity break a swim team’s losing streak? Yu Die was a genius child prodigy who lost everything she loved. Yu Die’s mother drowned while trying to save Yu Die and, in one very bad day, Yu Die lost her mother, her memory and her ability to swim. Years later, she crosses paths with Gao Hai Fei, the CEO of a multibillion corporation. Intrigued by Yu Die’s lost memories, Hai Fei hides his true identity from her and gets mistaken for a professional part-time worker who is a jack-of-all-trades. Yu Die asks Hai Fei for his help with the “Sea Horse” Men’s Swim Team, which has never been able to win a meet and is the laughing stock of the sport of swimming. With Hai Fei searching for a “mermaid” crush from his past, will he agree to help Yu Die turn the losing swim team around?

An unexpected accident left Day with serious injuries, making Itt blame himself for what happened to him. What will Itt do when Day wakes up with no memory at all? The person who used to be so caring and so loving has become so ruthless? Itt tells himself, "I must be patient with Day".