
I think it can seem like Seo-In is just jerking Yeongwoon around(and he is, a little), but truly he's just lashing out bc to him, Yeongwoon doesn't reciprocate his obsession. Seo-In's trauma is that his relationships with others(his mother, Yeongwoon in the past) all broke, either bc they were conditional or they left. He essentially wants an enduring relationship with Yeongwoon where the latter reciprocates his obsession.
Side note, the funny part about the others gossiping is that they aint exactly wrong. Seo-in can be kinda an asshole.

omg yes exactly finally someone that understands. So many ppl seem to be confused why SI plays YW like a fiddle but that man has abandonment issues cuz of his childhood trauma. He is scared of revealing his feelings to YW because YW has abandoned him and restarted his own life like none of the things they shared matters.

I'm so not a fan of Taegu's potential storyline rn. What he's doing isn't grooming because grooming implies that you intentionally raised someone in a way that 'prepares them' for you. There's no indication here that Taegu had any interest until recently. BUT the uncomfortable part is that Taegu still had a hand in Yeongwoon's upbringing. Sure it's legal now, but we never rly want to justify the romantic/sexual interests of someone that both watched someone grow up, and also has an older sibling dynamic with the other. Because at the end of the day, Yeongwoon is our viewpoint character and he clearly sees Taegu as an older sibling figure.
Justifying sexual interest like that just comes too close to grooming, and frankly, that's an area we want to stay far from, not toe.

It's never really a good idea to use religious or cultural terms too loosely, but just know that the author probably didn't do it with any bad intentions. We western readers sometimes have to remember that Korea is ultimately still a fairly conservative country with little personal connection with other cultures and mob thinking is basically the standard. A lot of the ppl aren't really aware of the concept of being culturally insensitive except when it comes to their own. This isn't me bashing on them, but just noting a fairly natural consequence of a country thats demographically very uniform.
The Muhammad quote may or may not be a saying, like how american's commonly use 'jesus christ' without really associating it with the religious name. Its likely that webtoon authors dont always write with the mindset that westerners will read it, and thus are less conscientious of its references.
One of them finally openly communicated what they want. Clearly it's not everything but we're finally making progress.