The novel is female-centric, but the way it's talked about (like a 1vs3 plot with the ML being not much more than a side character) is a misrepresentation of some fans of the FL's actress. While there are of course other male characters that play a role in the FL's journey, it still very much a romance between two important characters.
Having said that I expect the screenplay to be heavily re-written, both for censorship, but also to speed up the FL's development and focus the dynamic with the ML. Of course we don't know yet for sure who will play the ML, but all rumoured actors so far (even those that allegedly dropped out) are known for their leading man qualities. It wouldn't make sense for the production company to use a significant portion of the budget to pay top-tier actor fees, if they only use him as a FL character development tool. I imagine they have written a script that makes it worth it to cast a more famous actor - whoever he may be, eventually.
Having said that I expect the screenplay to be heavily re-written, both for censorship, but also to speed up the FL's development and focus the dynamic with the ML. Of course we don't know yet for sure who will play the ML, but all rumoured actors so far (even those that allegedly dropped out) are known for their leading man qualities. It wouldn't make sense for the production company to use a significant portion of the budget to pay top-tier actor fees, if they only use him as a FL character development tool. I imagine they have written a script that makes it worth it to cast a more famous actor - whoever he may be, eventually.