Yeah, I do lol. I've been doing it for about two years now I believe, though I dabbled in WattPad (I know, be quiet ) until I upgraded to AO3 and now I have multiple multi-chaptered fics. I just love writing lol.
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