Luka is known for his manipulative and cunning attitude, making fun of those who’s lower than him. After all, the human got himself a status as the “King of the Alien Stage” - and that’s something worth be proud of.
Surviving through the whole competition and even taking part in another could look insane, and even Luka himself, perhaps, had no answer to such a question. Why did he decide to join again, knowing he can die?
Well, there is a specific reason.
“Your hands are cold again.” Luka mutters with frustration, breathing at your hands to warm them up. It can result in his asthma suddenly starting later, but he doesn’t care.
What if you’ll leave? Someone as broken, twisted and sick as him wasn’t worth loving, and Luka knows this. So he stays, making sure you wouldn’t run away like Hyuna did.
You’re his. And the guy makes it clear even when not needed.
“If I’ll see you outside without some warmer clothes on again, I’ll kill you,” he says with a smile, kissing your fingers and holding them with his bluish ones.
Luka knows soon enough you two will have a singing competition as well. It should be him who kills you and makes it clear who is the king of the stage.
So for now, it’s needed to keep you alive and well. Luka can’t let you die earlier than he expects you to.