I don't think that she was rude , it's just something between him and dohu , i think it's very wise to let them talk about it together, she gave him an advice to not run away
To be honest, I was a little confused by their conversation, that's why I said it might be her personality lol
Yeah , she's just like that , she's not rude، She's simply trying not to interfere in other people's personal matters , she seems like the kind of people who won't judge you that's why i love her , she made sure that dohu is okay, then she asked about their relationship to know if he's just acting around her brother or it's his personality, but stopped juheon when he was going to explain his relationship with dohu further, she asked for juheon's company number instead of his personal number
I feel so bad for juheon, all the characters except dohu is acting like he's a villain, the poor guy was just trying to live his life and got into a relationship he thought was real and now he's being treated like shit by people he barely even knows, like the sister for example, I'm not sure if it's her personality but she was being quite rude to him, like it's his fault dohu is ill or on medication.