
Ok,.i dont remember, who is this Mr Bai?
And I would love to read all projects that translator uploaded on Mangadex cause that's where they prefered to....but please, I always have trouble accessing mangadex from my device...it's really frustrating!

Mr Bai is Guan Shan work colleague, another teacher, and apparently an old friend from college too. He first appeared in chapter 4 asking Guan Shan to replace him in the overseas trip with the students because his girlfriend wanted him to meet her parents ( because she was pressuring him to get married).
It seems Mr Bai is having a breakdown of sorts now that he is being forced into making a decision between coming out and break the engagement or get married and probably stay in the closet forever.

Literally MY 1st time reading , that taboo word of HiV mentioned in a rape-themed yaoi manga

No, it's also in "After Morning Love" :
http://www.mangago.zone/read-manga/after_morning_love/
I don't wanna part with our main couple just yet, they're just too precious! As expected from a love story that surpasses angst
, haven't seen the raws, how many chapters left till we switch to Seunghee's story?
Around 65 but these two are still reoccurring and their story continues along with the mc’s
Oh thanks! Turns out it still a bit longer yeaay