I don't know why, but I feel disappointed somehow. I think a more appropriate ending would...

I don't know why, but I feel disappointed somehow. I think a more appropriate ending would've been better. It feels like nihilism for the sake of nihilism and It feels hopeless.
Also it's not realistic, It feels like it's trying to appear edgy. People die and there's no reaction from the outside world. MC and ML continue to live happily while committing mass murder by saying there will only be more rumors while leaving the house. They think no one will file a missing person report or report them even though ML used to live in that same house and MC knows the people that died? What gives them that confidence?
The story implies that no good people survives and the only happy people in this world are happy because they stole the happiness from others, which is not true for many people in this world! They're just making things up to make it appear hopeless!
The fact that many innocent people died for no reason also...(the cinema guy, the phone carrying stranger). Was that also because of MC and ML's malice? If that's so then they're not so weak and good, instead they're evil and psychopaths. Taejun (the mc) says that If it was (hyun-ju), his friend maybe she wouldn't be swallowed by her own self because she's not as weak as them and that made me think...that a lot of the explanations were skipped in this webtoon.
If black mirror is the inner self of people then why should hyun-ju's self be filled with malice? It could be that only MC and ML's black mirror are filled with malice because that's their true inner self!
Anyway It feels like a bad ending in a visual novel game.
It has all the traits of a bad ending - skipped explanation, doomed world/surroundings, acceptance of the unknown(bad outcome).
Also why did the mirror choose them? Why is their malice considered the strongest? Because they're special?
It says at the end that every people has their own black mirror...even if that's true then why can only they control the world with it, even killing people? It they wanted to give that explanation then their parents could've been chosen because of their malice too!
There could be more than two people who can control the black mirror because of that explanation but still only two of them can control the black mirror...and the story ends with them saying everyone has their own black mirror blahblah. Another thing that I don't understand is why are both MC and ML considered essentially the same being that are whole because of each other? Their body morph as one near the end...Are they even themselves? They don't look like human for sure, it's more probable for them to be the mirror version (fake) version of themselves. Also why did MC forget ML when he was a kid if they're so special to each other? Him forgetting ML just because he wanted to be liked by others doesn't make much sense. After he forgot ML, he even stopped listening to the whispers and seeing his own mirror self. That also doesn't make any sense. A person can't just forget such a huge part of his own life that easily...another thing I need to ask is why is the black mirror only in their black room? If every people can have their own black mirror then it could be in every home? The first case was seen in 18th century and that was not in the black room right? So why did ML always try to make MC go to the black room after he turned into an adult?
Anyway while it started good and scary, I ended up feeling unsatisfied with the ending...