Manga/Manhua/Manhwa or what country is it from

https://www.mangago.zone/read-manga/miss_guillotine/

I think it fits all the requirements!

https://www.mangago.zone/read-manga/delivery_knight/

pyramid game
https://www.webtoons.com/en/drama/pyramid-game/list?title_no=2277
your letter
https://www.webtoons.com/en/drama/your-letter/list?title_no=1540
Magical 12th graders (weird title but its good, trust me)
https://www.webtoons.com/en/super-hero/magical-12th-graders/list?title_no=90

Ty to y'all(づ￣ ³￣)づ