Chyos really emphasizes "you can prevent this! you have to corrupt her a lot, and neglect her many times, and you can make her stop talking with Dasan"
He didn't seem to realize that he made Tia the type of girlfriend that would cheat on their boyfriend because he doesn't give her enough attention.
This is exactly what Hiba did, but Tia wasn't Hiba. Besides, we know how Tia and the MC's relationship was like from the beginning.
A boyfriend that fucks demons and leaves his girlfriend to the mercy of assholes is another story.
And if you tell me that it's because of Isha's corruption, all that stuff I've been saying that "it doesn't exclude the love that they feel for the MC" is pure BS. And you have to corrupt them to see the content. So, hm... sorry for that.
One thing to note that it is a long scene you have seen a hundred times before. So click "not tonight baby" is meant to be a "just skip seeing the scene" rather than being a neglectful boyfriend. But now it is being made into being a neglectful boyfriend instead. Meaning there is no longer a "fuck her but just skip showing me that scene" choice.
Also, it is based on timer rather than watching. It should be "after you personally watch her flirt with dasan 3 times without intervening she becomes his wanita". But no, it is "after X days go by without you intercepting the conversation" (which you might miss but still happens in the background)
As for "you have to corrupt her a lot"... the non corruption route is super threadbare and even has issues like "there is no way to get vial of water in pure route". It is just that corruption supposedly did not preclude love and exclusiveness. Also >4 is not "a lot" as far as corruption goes. normally need over 10 to get anywhere.
So all 3 "safety blocks" for this NTR route are super flimsy and easily missed.
Fuck, I am now seriously regretting burying dasan after killing him. I should have fed his corpse to wolves.