It's played as a joke. A female character is changing and the male MC sees her in her underwear. She screams and says this phrase because she is very traditional, and only her future husband is supposed to see this kind of bare skin. If she has a crush on the male character, she will usually follow up by saying he has to take responsibility and marry her.
Popular Asian saying (heard been said in Korean, Japanese, Thai, viet) basically used when the girl does something embarrassing or unlady like.
So basically our "I'm going to hell for this "
It's played as a joke. A female character is changing and the male MC sees her in her underwear. She screams and says this phrase because she is very traditional, and only her future husband is supposed to see this kind of bare skin. If she has a crush on the male character, she will usually follow up by saying he has to take responsibility and marry her.