I am so confused right now, after I finished this people are talking about some twin fucki...

I am so confused right now, after I finished this people are talking about some twin fucking the MC instead of the ml? So it's basically a rape.... Ungh... But it's so weird like I knew there might be a sibling when one of the chapters zoomed on the hoodie with the mask who also had blonde hair, but I genuinely didn't expect the twin to be fucking the MC? Like how did MC not sense something is off? (Also us...) I think ML might know about the twin but keeping it away from MC, and maybe they have been exchanging info about MC so they wouldn't get caught? But it's not just a theory of mine it's a MANHWA theory