I think with the love triangle between MS, HJin and HJoon, that they are all kind of toxic in different ways.…
I don't know what happens behind the cameras, but I can only say that MS's love triangle is very different from SH's. For starters, SH was very honest & straightforward with both SW & JS, about being torn between both of them and I have not seen MS do that. If he feels uncomfortable, he should say something to the people that make him uncomfortable, not his roommate. As much as I do not care for Hjin, I think it's up to MS to clear up the situation so everyone will be guarded.
Same with the other single housemates.
If you haven't seen it yet