This book is also called "Purifying the Yandere: The Cannon Fodder Heroine Turns Back"
The dream-like years on the Beimu Mountain Peak brought the two of them infinitely closer to each other's hearts. But an emotional entanglement from the past kept dragging the two into an abyss of no solution. Fate played a trick on people, and it turned out that she was just a substitute for the person he loved deeply in the past... It was not until she left that he discovered that there was such a deep misunderstanding between them. He searched for her and refused to give up...