Mari ... so what if he went out with your love oppa behind your back .. and you .. you went out with that baldly oppa fully knowing he has his wife !! What more~ that bald oppa is your brother's workmate ┑( ̄Д  ̄)┍
Yep, she can hardly take the moral high ground when she was the one who caused all of this mess by calling everyone "oppa". How embarassing behaving like that in your brother's house, she has no shame yet still thinks honorifics are relevant.
Yeah but.....Oppa is the honorific for *Older brother /Older Male in Korean terms. So not really her fault, it's the vocabulary that's confusing. Also, true...being the other woman in a marriage is, as low as you could sink. But I also feel like she could be meaning, "had this been a different situation and my brother was my boyfriend, would you've still snuck around and slept with him behind my back." That's my thoughts anyway.
GYUNGHA IS SMOOTH AF ヾ(☆▽☆)