If you are curious, the author wrote an article about a classmate (to ask for permission) and mathematics (subject). I am really curious. Let's take it as a joke.
Ninety-nine-year-old sexy female cockroach (offline main author) Qing Yuxian (online)
age difference
Male protagonist: Fang Pan—25—university teacher
Heroine: Feng Quanquan—18-freshman
The cold, stern and unsmiling male protagonist x the cute and lively chatty female protagonist
(The content is very curious…emphasized again)
Intention: Study hard