Shang Hao, who has a calm and quiet personality, falls in love with Chen Yi, who is humorous and witty. The two went from high school to college and then entered a happy marriage together. And Shang Hao, who is enjoying the happiness at this moment, faces the mysterious disappearance of his lover at sea on Valentine's Day, and travels to the past through a book just to find the trace of his lover.
Concept: Love across time and space