I have a feeling the girl has a crush on the mc so shes trying to get close to his sister first and get on his good side
crush and also a curious cat. i feel that yuna (the girl) is curious about ijin that's why she's gonna befriend the sister and ask her. because, i think all those who has connection with the sister didn't really expect her to have a brother, right?
mmmm i think yuna knows dayun first (maybe like an acquaintance) and then found out that ijin is her brother...
I have a feeling the girl has a crush on the mc so shes trying to get close to his sister first and get on his good side