Yeah, he definitely is one of the rare MLs who are actually decent. He genuinely cares about Pilsang and has been surprisingly sweet to him for the most part, listening to his requests and respecting his choices (No kissing, removing the heat alarm, etc...).
That said, I do agree that his cold-hearted businessman persona keeps getting in the way of his real feelings. Whenever things get too emotional, he tends to fall back on that detached, harsh side of himself, and that's often when he ends up being cold or distant toward Pilsang.
I can totally see him getting angry after finding out Pilsang hasn't been taking his meds and accidentally saying something hurtful in the heat of the moment. Not because he doesn't care, but precisely because he does ! He'd be worried about Pilsang's health and frustrated that he's putting himself at risk, but instead of showing concern, he'd probably let that cold, harsh side speak for him ╥﹏╥
And knowing Pilsang, he'd completely misunderstand it. He'd think Jooeon hates him and regrets being with him, get scared, and that could end up being one of the factors that leads to the runaway arc, before Jooeon even gets the chance to explain himself.
Not really, but I guess the confusion could come from the fact that the heat setting in the story is a very unusual situation, so it falls into a grey area. If you’re talking about the fing*ring at the beginning, Pilsang wasn’t conscious and couldn’t communicate consent, but he had been drugged with a heat inducer that was putting his body in a dangerous state, and Jooeon had to stop the reaction before it became life-threatening.
So, the scene is framed more like an emergency intervention in the story’s universe rather than a sexual advance (the way it's portrayed is closer to a life saving action, like giving mouth-to-mouth during CPR, where the purpose is to save someone, not seek intimacy.)
The first time they actually had s*x is different tho because Pilsang was conscious, more stable, and able to make a choice. Jooeon gave him the option to push him away if he didn’t want it and said he would stop immediately, but Pilsang clearly chose to continue and told him to hurry up and just f*ck him.
So yeah, I understand why the situation can feel complicated because of the premise, but within the context of the story, it isn’t portrayed as Jooeon taking advantage of Pilsang.
this is generally saddening for people who only rely on the another's perspective to continue just because someone's flag color isn't good at the start. character and story development exists, and this is why majority you see on this comment section is positive. please see for yourself. you won't regret it.

Stupid rich boy game aside, jooeon genuinely seems sweet and decent. But somehow i feel like he's gonna get angry or say stupid things when he finds out pilsang been lying to him about so many things. It keeps getting sadder everytime pilsang uses all the chance presented to him to be close to jooeon, he just wants love and care, but i know jooeon is gonna break him before heal him for real