Every man's heart is about to hide a person who has never been forgotten.
Geng Geng had been an ordinary girl before her entry to the best high school in the province by chance. She doesn't like her life there until she meets the brilliant Yu Huai, her seatmate - their names make up the word "Geng geng yu huai", meaning "Unforgettable memories". They don't like each other at the beginning, but soon they start to understand and like each other. To be as excellent as Yu Huai, Geng Geng
STUdies hard, and finally enters the same university as Yu Huai, only to find Yu Huai's absence - he disappears and never shows up in front of her again. After seven years, they meet again and the unforgettable memories still prey on their minds.