Ga Eul is a supporting character known for her role as the video editor for the main group of content creators. She is a high school student, one year younger than the protagonist, and is often recognized for her unique personality and practical intelligence.

Ga Eul has a distinct appearance, characterized by her short, chin-length hair with bangs that fall just below her eyebrows. She has pale skin and typically wears light makeup, including pink blush and lip tint. Her usual attire consists of an oversized yellow jacket worn over her school uniform, and her classmates often describe her as cute. Her name, Ga Eul, means autumn in Korean. In the original source material, her dialogue is frequently followed by the "@" symbol, which is a quirk of her speech pattern that she likely picked up from her father. She reportedly owns a different yellow jacket for each day of the week.

In terms of personality, Ga Eul can be somewhat oblivious when it comes to social cues, for instance, failing to recognize when boys are trying to flirt with her. One of her most defining traits is her manner of speaking, which is often compared to that of an old man, using tones and phrases not typical for a girl her age. Despite this rough exterior, she is caring and sharp-witted. She holds a secret romantic interest in the main character, Yoo Hobin, but she tends to hide these feelings behind her blunt and mature demeanor, occasionally attempting to speak in a more feminine way around him.

Her primary motivation is to support Hobin and the success of their shared NewTube channel. She is drawn into the central story by her expertise; after leaving precise, technically analytical comments on Hobin's early fight videos, she is recruited to be the group's official editor. Her role quickly becomes indispensable, as she uses her technical skills to polish the content that contributes to their online fame. Beyond editing, she is also made the Vice President of the Hobin Yoo Company, a position that gives her significant responsibility within the group.

Ga Eul has several key relationships that define her place in the story. Her feelings for Hobin are a central aspect of her character, creating a subtle undercurrent of personal motivation behind her professional support. This puts her in a friendly rivalry with other female characters, such as Rumi Yeo and Bomi Choi, who also have an interest in Hobin. She lives alone with her father, who runs a dry cleaning business, and her time spent living abroad before returning to her home country has given her a somewhat independent perspective. There are also hints of a mysterious connection to Ssamdak, Hobin's martial arts mentor; she possesses handwritten notebooks and unpublished training videos marked with the group's name, suggesting a deeper, unrevealed link to the origins of Hobin's fighting style.

Throughout the story, Ga Eul demonstrates significant development as she transitions from a perceptive outsider commenting on videos to a core member and manager within the company. Her skills and confidence become more apparent as she takes on an active role in the group's affairs, moving from behind the editing desk to directly engaging with the challenges they face.

Her notable abilities are twofold. First, she is a highly capable video editor, whose technical proficiency is a major asset to the channel. Second, she possesses a strong foundation in martial arts, holding a black belt in Taekwondo and understanding real combat techniques from a theoretical and practical level. Her fighting prowess includes knowledge of various strikes, such as overhand punches and up-kicks, as well as grappling techniques like the flying armbar and triangle choke. She has demonstrated her combat ability directly in conflicts, proving that her expertise is not merely academic.