Wang Guanzhi, a 28-year-old university lecturer, has spent years caught up in one blind date after another, until she meets Zhang Yu, a swimming instructor from her hometown.
She realizes that the owner of the gym is even more insecure than she is.
The death of his childhood friend, who drowned after he failed to keep a promise, has kept Zhang Yu in the shadows ever since, adding to the unease he already felt growing up as a left-behind child.
He teaches children to swim while quietly protecting the woman he loves.
When his friend's younger sister threatens him, he silently makes plans on Wang Guanzhi's behalf.
When his parents ask to borrow money, he refuses. She comes first in everything.
From the first moment he sees her, he knows it's his responsibility to protect her happiness.
