So! It's a BL manhwa, and it's about a this guy who died trying to save someone he loved from a bomb(?) but they were inside a building and his unrequited love was already with someone. But that was the only kind act the main character did in that life time toward his unrequited love. And after dying he came back, while he was in the middle of class. He then decided he'll try and save everyone and stay away from his unrequited but once he see's him he can't help but fall for him again!!
AND THIS IS A GUIDE VERSE..PLEASE HELP
If you still want to know here it is https://www.mangago.me/read-manga/success_oriented_guide/
A bl manhwa about the male lead hiding his obsession about the male lead by being his friend.
this one really good:
https://www.mangago.me/read-manga/shitsuren_junky/
manhwa where mc is trapped in bl world as an extra
these r manga but theyre the only ones i could think of
https://www.mangago.me/read-manga/mobyama_aji_to_mobtani_crou_no_kareinaru_nichijou_e_no_chousen/
tw: sa
https://www.mangago.me/read-manga/sex_with_the_love_interest_but_i_m_an_npc/

Okay it's a story where this man finds this little kid and takes him in and raises him but he could be this whole other being or creature (the kid)
But years before that before he met the kid he was like this strong martial arts fighter(?) and then along the way he fought this great massive being that might just be that little kid he took in. And there is also this one chapter where he was a student at this school where more kids had power like him. But he got into this fight with monsters in the middle of the city.
A truck crashed and what came out was these "alien" like monsters and this guy that the male protagonist just met.
The two of them fought them off. There was a civilian in the building that filmed the whole thing and he kind of got even more well known from that.
(This is a martial arts manhwa it's one of those kinds of stories so if anyone knows what this is or anything similar please let me know!!!)