Xu Wan is a nursing student and picked up Xie Lin covered in blood at the school gate. She fed him, helped him change his medicine, and even stayed up late to write his thesis defense draft. After Xie Lin recovered from his injury, he disappeared without even saying thank you. Three years later, Xu Yuan's younger brother suffered from a rare disease and needed expensive medicine. The hospital director suddenly waived all fees, and the donor remained anonymous. Xuyuan bumped into Xie Lin in a suit and leather shoes at the door of the ICU. He had lost a lot of weight and was still wearing the ugly red string she had knitted on his wrist. Xie Lin lowered his eyes and said: "You said that you don't need to say thank you for saving a life. So I just returned it.
