San'er's real name is Meng Ziming. He studied at Jiangcheng City Experimental High School, was in the same class as him and Wang Xing, and they lived in the same dorm room.
The two of them even shared a bunk bed, being as close as Wang Xing, that cheerful fool.
As for why he was called 'San'er', it was because when this guy first fell in love, it took him two months to realize that his girlfriend already had a boyfriend, forcing him to be the third party, hence the nickname, unrelated to his age.
However, it must be mentioned that San'er was a school celebrity. Not only was he a good student, but he was also extraordinarily handsome. Even Su Qing had to admit that this guy's excellence was somewhat infuriating.
Not just in school; even in their class, several girls liked him, and those who had a secret crush on him were countless.
