Please read this too. (I'm not replying to Usernameunknown0117, I'm replying to my comment).
I just wanted to make my posture clear since I didn't mention it in my main comment: I'm against zoophilia. I have boundaries and never mentioned liking this work nor being against it, I was just explaining the difference in the two tags and what they're supposed to represent. I'm not talking about my opinion of the work, I'm explaining something general.
What I tried to mention in my main comment was that the yaoi-only tag is used mainly in stories with no plot or point, that authors use it to warn people about their work.
Just think of it like this: An author wanting to create a pornographic story, they're adults and use their occupation and talent for the stuff they like. They have kinks and fetishes and put it in their work? Alright, it's their work. Some readers don't like it? Alright, they drop it because they're not the targeted public.
This work is meant for other people, if you don't like it don't read it and ignore it. It's valid, there's no reward of a happy ending because it's porn with no story. In porn there's many weird stuff, we know that already. Some are harmless some are harmful but we know the majority is harmful.
Yaoi does not describe BL. I already explained that.
I'll explain it again: Yaoi is porn, sex, sexual intercourse between two guys. BL is romance between two guys.
The same as josei, it's porn, sex, sexual intercourse between a woman and a man. BG is romance between a woman and a man.
If those tags are paired up together in a story it's a story with plot and porn. If it's just one tag it's just romance and if it's the other tag is just porn.
Hope it helps if y'all didn't get it at first. Comment if you need more clarification.

The author went on with the idea of an anomaly suddenly caging people in and not letting them leave until they fulfilled its 'game' condition and using the mc's bad luck as an excuse for the ml and mc to have sexual intercourse.
This whole story is just going to make characters go through a series of situations in which they'll have to do stuff against their will (sexually related). Kinks and fetishes are there because the idea of a world full of anomalies is just for the them to make sense, it's creative tbh.
There's no interesting plot, no interesting theme or moral of the story. It's basically just porn.
I see some people criticizing this because they are unaware of the difference between BL and yaoi.
This work only has yaoi, other works may have a BL tag and a yaoi tag because it's a story about a couple and it has mature themes in it. Other works only have the BL tag, meaning there is no sex or sexual topics heavily implied on the story.
Read the tags and learn differences, that's why they're there. They warn and have a meaning, if you don't know the meaning just look it up or don't read it.
Of course, this manhwa is just meant for some people, you're not obligated to read it if you don't want to, just know this isn't BL.
An author is allowed to use their free will to create a story like this, kinks or not, sensitive topics or not, they're just sharing their thoughts through that work and trying to find a community that likes it. They have no fault until they have actual real controversy outside of their occupation.
Thanks for reading, leave comments if you wish to, just be respectful.