Park Hyerin is Yoo Seorin's coworker, with a cheerful, friendly personality and the kind of easygoing nature that lets her get along with anyone. Unlike Seorin, who prefers to keep to herself, Hyerin loves chatting, inviting people to eat together, and lightening the mood at the office.
Though she's often seen as a little too friendly, Hyerin is actually very perceptive when it comes to other people's feelings. She can tell that Yoo Seorin isn't a proud woman who simply hates socializing, but someone carrying a burden no one else knows about.
Hyerin has tried several times to get closer to Seorin, but she always respects the boundaries Seorin sets. She never forces Seorin to open up, only hoping that one day they can become friends who trust each other.