Tang Xiaofei and Zhang Xiaolong were childhood friends.
Tang Xiaofei left suddenly, leaving Zhang Xiaolong alone.
Ten years later, they met again in a school.
Because he resented Tang Xiaofei for leaving without saying goodbye when he was a child, Zhang Xiaolong deliberately pretended not to recognize him and bullied him.
After a quarrel, Tang Xiaofei was afraid of being disliked by him, so he transferred to another school and left the city.
Tang Xiaofei indeed abandoned him again.
For three years, Zhang Xiaolong wanted to apologize to him, but could not find Tang Xiaofei.
Intention: farewell