Yoomin obviously has more backbones. Hyundo was hurt by sojeong for YEARS, yoomin was happy for years and once she got hurt she IMMEDIATELY dumped iseon. Yoomin would never even stay a day with iseon if he ever treated her like what sojeong did to hyundo. When it comes to "self-respect", yoomin is simply willing to be iseon's friend, that's nothing compared to hyundo who was literally sojeong's servant despite being treated like sh*t repeatedly for years.

And I know what .... He's right! Now why would you agree to be friends with that man. Like have some self respect I just need her to move on quicker from her ex