One of my favourite things about this manga, is how the artist draws Woo-hui's glances, facial and body expressions. They are - for lack of a better word - very expressive. If you didn't pay close attention to her glances, then you've been missing an awful lot of subtext. The manga doesn't need to tell you how she feels, because it can show it instead.
You can always tell how she's feeling in that moment. Like, when Ji-ho talks about Yeon-woo, or her ex, she avoids looking her in the eye, and looks into the void with a slightly annoyed expression, Meanwhile when she is very interested, but doesn't want to show it, she keeps looking away, but glances/stares Ji-ho from the corner of her eyes.
Whenever she has her boobs touched by Ji-ho, her body language is just as honest. Even without the SFX, just from how she curls her fingers and bites her lips, you can tell, that she's feeling it.
In this chapter she avoids Ji-ho's eye, when they talk about finding a date for her, suddenly feeling very uncomfortable with discussing this in front of Ji-ho, but then she just keeps glancing at her anyway.
Yeon-woo is almost the opposite of Woo-hui, in this regard. She always hides behind a smile, and you can never read any emotion from her expression. And because of that mast, it feels like she's always teasing people.
Ji-ho, and Sun-deok is just way too forward for this. Their expressions usually match their words, except for when Sun-deok is trying to seduce Ji-ho. And that's hilarious, because of how much she over does the whole body language thing, and Ji-ho still not noticing any of it.