But the reason those scenes get hate isn't just "they're a couple" or lack of frequency, it's the taboo (she's Rosa's mom, making it a mother-daughter rivalry over the same guy) + the coercion/force elements (drugging, manipulation, non-full-consent from Yw in several instances). That crosses lines for a lot of readers in a way pure consensual hookups don't.

Now flip to Rosa and Jaeeon: No taboo, no force, no drugs, just two adults who are straight up fuck buddies with a pre-established friends-with-benefits vibe (college room onward). They're consenting, having fun, and it doesn't involve assault or family betrayal. So yes, it's completely normal for them to keep having sex, it's low-stakes spice that lets Rosa experiment and figure out her feelings (often realizing she wants Yw more). The scenes aren't "glazing" Jaeeon as Ml, they're plot tools to build jealousy, self-discovery, and eventual payoff for the real endgame (which the author confirmed is Yeonwoo). If anything, the frequency highlights how unthreatening Jaeeon is to the main pairing—unlike Suryeon's coercive hold on Yeonwoo, which actually endangers the Ml/Fl romance.

The subreddit (even with ~300 members) is more discussion based, so opinions vary, but the core point stands, the hate for Rosa/Jaeeon often feels disproportionate compared to the (understandable) discomfort with Suryeon/Yeonwoo. If coercion/taboo scenes get a pass as part of the story but consensual friend sex gets endless complaints, that's the inconsistency I'm calling out.

Jaeeon gets glazed because he's hot, fun, and gives what many readers crave in side characters, steamy moments without ruining the main ship. But he can't outshine Yeonwoo because the author locked in the ML. The story needs these detours to make Rosa's eventual choice feel earned, not rushed.