To make things dramatic? ( ̄∇ ̄") Lol i guess also a takeaway that she's alive is through the author's other work. Around 100ish chapter where a pink haired character (who is a writer) published a book and one of the FL cries and asks if "she dies in the end" hinting on the character on the book. And the ML spoils him that she's alive.
The author loves crossovers in her stories (just like the couple here on the last chapter) so when i read that, i knew "that book" is about this pair.

Is she alive or not ?!!
I've read this twice and I still don't knoww • ‿ ,•
Nevertheless this is an amazing book