They were just alumni of the same class. Mo Ran didn't know Sun Mu, but Sun Mu knew Mo Ran. After passing the exam that was a turning point in their lives, who would have thought that on the opening day of the new school, Mo Ran and Sun Mu would enter the same high school together and continue to be alumni of the same grade.
Countless strange classmates passed by Mo Ran, but Sun Mu took the initiative to call Mo Ran, making Mo Ran stop. Sun Mu told Mo Ran: He knew Mo Ran in junior high school. In this way, among strangers, Mo Ran regarded Sun Mu as his best friend, and from then on, they treated each other as brother and sister.
They called each other brother and sister, and nodded and smiled. In the end, even though they were just passing by each other, they had already become the most profound imprint: Mo Ran would rather be just brother and sister with Sun Mu. If they were just brother and sister friends, at least they would still have a tacit understanding with each other and would not become strangers they didn't want to mention.
This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.