
My theory is that the black-haired MC (I forget his name lol) is maybe a time traveler or was somehow able to reverse Ho-Hyun (regular MC)'s death or fate. Hence, why he knows who will die, who will live, what happens and why he's so protective of the regular MC. I guess we'll see, but I feel like anyone can think of this theory when reading lol

This is gonna be spoilers
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Black haired dude is actually the cause of all of these stuffs, he did an experiment and failed which lead to this and every time Ho hyun(our guy) dies the time revieves it becomes an endless loop so he knows when what and how Ho hyun will die and in order to prevent the endless loop he tried to protect Ho hyun and keep him from dying
Maybe... Yellow??? Lmao. I mean, he's been upfront about his relationship goals (or lack of) but he does have a bit of a manipulative way of speaking -- "stop bringing other people into your business", "your sob story", and assaulting him while he was sleeping was a big no no. I mean... It's yaoi. This is one of the most tame ones I've read, but hopefully it'll get better.
I need Yeomin to be actually understood without being taken advantage of because of his personality and situation. That's my biggest wish.