If Hyundo is out of the picture, Yumin and Iseon could work it out and get back together. All they need is communication. This is why the author first end things with Hyundo and Sejeong to help Yumin. What she has been looking for Iseon for six years, she got it from Hyundo in just a month. I hope Iseon will keep his promise to support Yumin in everything that will make her happy.