1. 않걸랑 is a conjugation of 않다. It has a meaning of [does not ~]. It is used in informal contexts such as when one is talking to one's close friends(It's almost a slang). Another forms with a similar meaning/usage is 않는다고, 않는다구(slang), 않거든. So if I were to translate that into an English equivalent, it would be something like this: "I, 진유미, am a sucker for thugs or playboys. But I would never fall for that naive nerd. Like ever. " 2. Indeed, ~느라고 means because of~ or due to~. With 하 added in front of it(~하느라고), it means because of doing ~. With 생각 added in front of that(생각하느라고), it means because of thinking(about ~). The whole phrase after the comma (내 생각하느라고?) means because of thinking about me? The phrase is used in anastrophe. When you move that in front of (늦잠을 잤나), you get this: 내 생각하느라 늦잠을 잤나? which then is easily interpreted as "Did he oversleep, thinking about me(last night)?" I'm not sure if the speaker is deluded or she's just cocky because she's good-looking but obviously she wants to(or already is) flirting with that 재준 guy. Surely you know. 3. ~이야, in this context, is an abbreviation of ~쯤이야. When you say [~쯤이야](with ~ being an action or an object), you're saying that this something is not of importance, that it is not a big deal. The speaker is saying that her makeup is no big deal because, as she mentioned in the preceding sentence, her today's makeup doesn't even match with how much makeup she used to wear in her previous school. Hope that helped.

1. 않걸랑 << 않(다) + 걸랑 걸랑 is a short form of 거들랑. 거들랑(거든+ㄹ랑) is an emphasized colloquial expression of 거든. 반하지 않걸랑 = 반하지 않거들랑 = 반하지 않거든 A한테 반하지 않걸랑 means "I don't fall in love with A (you know)" 2. 늦잠을 잤나, 내 생각하느라고? is an inverted sentence of 내 생각하느라고 늦잠을 잤나? Did he oversleep because he was thinking of me? 이야 is a particle used for emphasis 이야 means "only if it be, if (it be), when it comes to, even, indeed" For examples, 그 사람이야 훌륭하지 He is indeed a fine man. 풍경이야 한국 따라갈 나라가 없지 For[As for] scenery, there is no country like Korea. 이 정도 화장이야 기본이었다 This level of makeup was pretty basic.