I was thinking about this as I went to bed, but to build on your theory, I wanna talk about why the main characters have a bond and what made it possible for our main character to have this power. Firstly, the scary story they (the parents) told the main love interest about the black mirror. Because the webtoon is named black mirror, we know that it must be important. The parents told him: If you look into the black mirror on a dark and stormy night, you will be cursed. Well, what if this curse was what is causing these bloody deaths? The kids went into the black room out of fear, one got cursed, and caused the death of the main love interest’s parents. This was important because not only was the bond already strong, it got even stronger. He rid him of abusive parents, almost like he did him a favor. Our MC didn’t intend it, and it probably traumatized him (something stressful or scary had to have happened before they inevitably died). The reason our MC doesn’t remember isn’t only that he was being ostracized, he was dangerous. By forgetting it, he didn’t have the risk of doing something. The main love interest knows that and is for that reason, upset with the MC. The curse theory is backed up by the first scene, where he sees a hand lead him to the house where our ML is smoking. It was the first time in forever that something bizarre happened, causing him to follow it. I guess it could be that they are tethered to the house. The MC is always drawn to it, while the ML’s emotions affect the house. I’m still trying to figure out the glass scars and the mirrors quote, “don’t worry, there are plenty of mirrors” or whatever. Going back to the movie theater thing you talked about, we last saw the man with hands on him, and then they were just blood. So we can assume that the hands rip the person apart, the reason there is blood everywhere. It also makes sense why the ML says, during the horror movie, imagine the people you hate ripped apart like that. He is hinting at his power, and when he imagines the dad ripped to shreds, he gets chills rather than relief. He is not imagining, he is remembering how he pulled the man apart. That is why there is incessant tapping from the black room. The ML also says it is his favorite room, and when he goes in, there is smoke and whispering. Which makes me theorize that he has accepted the mirrors and has long conversations with them where he smokes. On the opposite end, the MC is rejecting it. When they tell the police what happened, one is terrified and the other seems oddly calm.
I also wanna add to your theory and not branch, the ML is manipulating the MC into breaking away from friends. He encourages him to skip school and miss important tests that affect his grade majorly. He didn’t like him going to the police academy, and wasn’t happy with his friends, so he is trying to remove them from the picture. The MC could just refuse the pushes, but he doesn’t because of his fear. The house is mortifying, and his only escape is the ML. Thus, the scenes where he admires him and feels safe in his arms. Like that scene in the movie theater, where he sees the man disappear and automatically takes refuge in him. (Major spoilers ahead for 1984) Like how Winston takes refuge in O’Brien even though he is the one administrating the torture.
I know that the mirror makes it so that the MC is always taunted and is always suppressing his inner emotions, while the ML’s reflection always reveals his true intentions.
Anyway, the theory isn’t complete and I still have loose ends, like if the mirror quote was meant to feel like watching eyes or something else and also why the door is always open. I’m sure someone else has a theory for this. Anyway, I know it is a mess, but that’s my quadrillion cents lol
I feel ML knows about MC but wants him to remember. ML is not manipulating him. He is only bringing out the MC's real self. MC forced himself to forget the past and lived all these years like a robot. He doesn't allow himself to get angry or sad even when people bully him. So ML is helping him reveal his real psychopathic self.... Cool
True... Imagine committing a crime with your friend then the friends forgets and became a police. While you remember everything and accepted it. Of course you will want to make him remember. And again I feel like ML accepted what happened because he was free from his abusive parents. He doesn't need to see them again. He will worship the mirror.... I can't wait for the cool villain power couple.
If ML knew since they were kids that MC had that ability, then he would know MC cant control it and would accidentally k!ll someone at the slightest fear or anxiety and etc.
So that would mean he deliberately chose a theater with horror movie playing so that MC would accidentally do it due to his fear, and maybe ML hoping MC would remember more when that happens. WHICH BRINGS ME TO MY POINT: ML is not only manipulating MC with words and actions, he could also be manipulating circumstances just because he knew more about MC and their past!! >:O
MC U BETTER GET FAR AWAY FROM HIM WHILE U STILL CAN THERE'S A BIG RED FLAG RIGHT THERE SO RUN FFJDKFJFJ