Jeonghyuk Oh's ex-girlfriend

She was Jeonghyuk Oh's girlfriend of two months, before they broke up. She was the last person Jeonghyuk was in a relationship with before he decided to see Professor Frost.

Appearance
Jeonghyuk's ex-girlfriend is a pretty young woman with an average height and build. She has long, dark red hair that reaches a little past her shoulders with slightly wavy bangs that are swept to the side of her face and light brown eyes.

During her date with Jeonghyuk to the bar, she wore a brown jacket with faux, white fur at the collar over a black tank top and a red pencil skirt that ended above her knees. She seems to have a rather expensive taste when it comes to fashion, as seen from the accessories she wore as well as her reactions to Jeonghyuk's gifts.

Personality
Despite dating Jeonghyuk for two months prior to the start of the series, she did not develop any feelings for him. Although she continued to see him, she kept him at arms length and may have feigned interest in him because of the lavish gifts he gave her.

However, it is possible that she stayed for as long as she did with him because she thought there was still a possibility for her to fall for him, but eventually she started to take advantage of his feelings for her.

The Empty Man Arc
She enters the bar alongside Jeonghyuk and leaves him to order while she settles down, placing her hand bag beside her and away from her boyfriend, which the bartender notices. She points out the wallpaper on the wall, and says that it looks like a mask.

Jeonghyuk surprises her by gifting her with an expensive looking ring, and she thanks him, but is displeased when Jeonghyuk talks about spending the rest of their lives together.

During this time, the woman exhibits closed body language and does not like to hear Jeonghyuk's promises of a future together. Because she is so uncomfortable, she makes an excuse to go to the bathroom, then leaves with the excuse of feeling sick.

Throughout this whole exchange, Frost is able to analyze the girl's reactions to determine that she didn't like Jeonghyuk back.