je-oh and heesung are very similar people. she saw some of the same qualities that she possessed in je-oh just unrefined (which is why she set him up). it makes sense that they fall for the same guy. and also makes sense ( i THINK) why the jealousy in seongrok bubbles up so easily w je-oh when he feels like jeoh is leaving him behind, because heesung did that.
if i was ice dr doh and me woulda been tussling cus im not about to apologize to somebody for doing what they told me to do like take that shit up w mj not me! staring me down and shit