Okay guys i cannot seem to remember for the life of me. Who is this lady ???

His aunt I believe

Hee-seo's Aunt (his late mother's sister), he holds some resentment towards her because after his mom did what she did, his aunt didn't take him in and all this time later I think while he was still a teenager/young man she offered him comfort/to take care of him if he needed help and ofc he declined because of that but also now being with Mr. Cha

I wrote all of this for a recap on her from my memory

Damnnn u have some crazy good memory!! Thanks a lot