I can see where Yooil's coming from. Growing up with parents like that, I'm sure that more than anything, she wants stability and security in her life. I'm sure that with her low self-esteem—despite her subconscious feelings—she doesn't even consider dating Mooyi to be in the realm of possibility, which is why she answered like that—because she didn't think he could possibly give someone like her the undivided love that she wants, so he's not her ideal type. I mean, heck, she's not even sure that their friendship is real and not a fleeting fancy of his!