whatever they do in that hotel room, she wearing sexy underwear ... but in ep.5 she call him again at the hotel and he replied he is busy and can't go.
Gao Xi is mentioned in cast like Gu Wei's ex-gf but I suppose she isn't, it's just what she wants and she using her father position and ML mother for her purpose ... my understanding after 6 ep :)
My theory: I guess Hee-Do suffers from a K-drama level amnesia, that made her forget her memories from childhood…
in a previous episode, when Hee Do chat with her mom, in present days, her mom told her that she meet Yi Jin a month ago and Hee Do seems uncomfortable hearing about him, like she dislike about it, so ...
poor you!