Responses
I totally agree with you because that saying makes it seem like every straight friendship between a man and a woman is the pre-stage to a relationship. These kinds of lines seem okay to read in passing, but it's important to think them through. I don't think this reflects the author's own beliefs and that it's just in the character, but still I find them pretty misogynistic and two steps away from Bioessentialism.
Small rant warning: I hate some of the closed minded lines in manhwa sometimes (even the ones that are just there to fill in background character lines for the story). I know I am raging about something not significant to the story but one of the lines made by a background character was ”There is no such thing as friendship between men and women” and it made me so frustrated cause what the hell? that is so misogynistic and closed minded, who even thinks like that? Of course I have seen way worse but it is still horrible to say and not true at all Σ(っ°Д °;)っ. The bigger point is that it makes human lives seem insignificant, as if people are just in a market for romance instead of living their lives.