Using a watch she found at a beach as a child, Kim Hye-ja tries to manipulate time to prevent her father from dying in a car accident. Unfortunately, trying to manipulate time came with some consequences. Hye-ja ages for every occasion she turns back time. Meanwhile, her friend Lee Joon Ha is struggling with family problems which pushed him to give up on his dreams. He now works as a scammer at an elderly care centre fully unaware that Hye-ja, who has now turned into an old lady, goes there to pass time. Once they meet, they realised that both of them have changed.