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It was a manhwa where they are trapped in a mall, I supposed, or a building. The other character has a crush on MC and he devised a plan to confess on a sort of building. I remember at the end that the building breaking down was supposed to be sort of a harmless joke but it was a real danger.
Is it this one?
https://www.mangago.zone/read-manga/death_match_1/
There's this guy who is like very aromantic and or asexual but is a BL artist. He wants to draw poses and I think hires a guy to do the poses for him. But amidst that situation, the guy who poses for him falls in love with him I think. The BL artist guy wears glasses.
Haven't read it in a while but it sounds a little like Oh! My Assistant.
https://www.mangago.zone/read-manga/oh_my_assistant/
Pretty sure its
https://www.mangago.zone/read-manga/sensei_mou_dame_desu/
imma walk him like a dog sis