Kyung Hae-Jin is a 26 year old, assistant of Min-Seok, who's actually romantically interested in Seo-Hee, born in the 1st of August, she was responsible for Seo-Hee's true self-discovery, and changed her to become who she is later on. A very self-aware, charismatic, gregarious and boisterous individual, she lives in the moment with barely any structure, before Min-Seok met Seo-Hee, she used to be Min-Seok's childhood best friend, and was responsible for facilitating his research about his mother, she was, as Min-Seok used to state, "to be the sister I've never wanted, but needed." She's explicitly open about her desires, indulging in worldly pleasures, up until she met Seo-Hee. Before she met Seo-Hee, she used to be a hedonist, unstable, drunk, engaging in illicit activities, not listening to Min-Seok's warnings, and always ended up to be in some situation or the other. The indulging in the sensory is to fill her void, her void and her fear of being unloved, of being abandoned forever. During her childhood, she's never had any real friends. Born into a rich family, though her parents were kind and almost too perfect, she felt like she lacked the freedom in society, leading her to yearn for someone she could rely on, and shield herself from the fears of living in a restricting society. She's overly possessive, and often creepy, which initially drives Seo-Hee away from her due to her intense energy, she's a loyalist to those she loves, and those in her inner circle. Always chasing after what she wants, her philosophy is "what I see, I claim." And that's oriented towards people as well.