What Lin Zhixia stuffed into Jiang Wang's desk seven years ago was actually not a love letter, but a "farewell letter" (he had to transfer schools due to family changes). The "love letter" Jiang Wan saw was actually another key clue, or Jiang Wan had known for a long time that she was going to transfer schools, and that love letter was the key to the misunderstanding. The real twist is: Jiang Wan's "hate" for the past seven years was actually based on his belief that Lin Zhixia "played with feelings and disappeared", but the truth was that Lin Zhixia was forced to leave in order to protect him.
Intention: Redemption and healing of love, perseverance and responsibility, growth and self-realization, preciousness in the ordinary