Well, since several issues of the novel Hui Mu have bought Casual JQ Shenma and don't know, the setting of the article is in China. The setting of "Ming Fei is a freshman in high school and Chu Zihang is a senior in high school" is also different from the original work.
It's the joke where Chu Zihang remembers Lu Mingfei~
Another thing to note is that Chu Zihang has a secret crush on Concubine Ming~
Ambiguity is what makes you feel good XD~
The characters are probably... A bit... Ooc, so again, please forgive me.