Jae's Links
Jae is, admittedly, not Seongmin's biggest fan due to the way that he sees Seongmin treats his girlfriend, Ji-Yu. He is quick to defend his girlfriend when he sees that she is put in a tough spot by Seongmin. He remains civil and polite only because Ji-Yu wants him to.
To put it bluntly, Seongmin couldn't care less about Jae. Internally, she envies the deep love and connection Ji-Yu and Jae seem to share. She is often curt and dismissive of Jae on the rare occasions they do interact.