Honestly, I hope there will be some kind of twist and he doesn't end up with Yahwi. That's why I keep reading... maybe you're curious as well? The author did mention the endgame ML isn't decided yet. (Although it is plainly obvious that his "first love" and "childhood friend" will be endgame.)
I don't even know why I keep reading this when I know that Jooin will end up with that abusive, toxic, violent, manipulative and dickass named Yahwi.