NOVEL SPOILER:
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Hey guys, in the novel Ilic actually does have a dream that Sayan will die, and even though he doesn't die in the novel itself, it is heavily implied that he will die later on because he is super sick. Also, Ilic never actually tells him that he "loves" him, as that was added in the webtoon. In fact, it is made pretty clear that even though Ilic understands they are a couple and cares for him, he doesn't love him the same way Sayan does, like true love. On Twitter, someone asked the author to please tell us if Ilic actually loves Sayan in the end and she said she would "leave it to our imagination," but that is what the novel implies, that he doesn't love him the way Sayan wants. Then in another tweet someone begged her to please just say he loves him and she literally said "no" xD, meaning she won't confirm it but it is understood that he doesn't love him. I was reading another forum discussing the ending of this novel and honestly everyone feels the exact same way xD In fact, if you go back and read this webtoon with that mindset, you'll realize it really is like that.
The story closes with Illic noting, "I kissed Sayan ALIVE in my arms." Sayan is severely sick, and Illic already had a premonition dream about his death. It serves as subtle foreshadowing that, despite this moment of intimacy, Sayan doesn't have much time left.

seeing all the love for this as if he isn’t in this by force is diabolical, checked out the side just one chapter and he still fucking hates his ass. he had a girlfriend and a life and then was turned into that man’s personal prostitute. i’d love to remind you guys he’s literally complying because he’s given up on fighting for his fucking freedom.