A tall man with brown hair covering his neck and brown eyes. He is characterized by his green Japanese-style top and black shorts. Usually sly, playful, and clumsy, he is inherently affectionate and warm-hearted. He sometimes gets scolded by Sleepground for solving cases without taking money, but when he is serious, he shows a reliable side by taking care of his people. He is a former Protector and the current CEO of 'Under Web'. Inspired by Suhyun's idea, he opened a fixer agency to help the underdogs at the very bottom, whom even the Protectors' hands cannot reach.

A man with black hair and odd eyes (one yellow, one purple/modified). He is characterized by rabbit ears and wears a white hanbok with a purple outer coat and pants. Fundamentally kind and altruistic, he truly cares for his teammates. Being the most normal member of the team, he is mainly in charge of nagging, but he is also quite mischievous and plays pranks occasionally. He is the Vice President of 'Under Web' and the site operator. He mainly manages Under Web and the system, and has the ability to directly access programs.

A teenage girl with dark brown braided hair that turns sky blue at the ends. She wears a blue hoodie and jeans over a white hanbok, and has a butterfly-shaped chip pin in her hair. While she appears dogmatic and reluctant to accept help from others, she actually has smooth relationships with her teammates and is surprisingly affectionate. Generally cool-headed, she also possesses an unexpectedly lively side. A member of 'Under Web' and a 'Pure'. She is skilled in both intellectual battles using her brain and direct combat. She often bickers and squabbles with team members Rather and Gongryong.

A man with a slim build. He is characterized by red hair, red eyes, and slightly drooping eyelids, and wears red Chinese-style clothing. He has a sly yet calm personality. He is fearless and very quick-witted. He also has an emotional side, enjoying rainy days. A member of 'Under Web', he has a history of working for the Steel Frame Gang. Due to modifications received from a demon, large and small zippers are attached to various parts of his body, such as his back and arms.

A man characterized by wheat-brown hair, white pupilless eyes (slit eyes), dog ears, and a tail. He wears a Japanese-style outer coat with the character 'Hwan' (煥, to shine) written on it over white clothes. He has a calm and sly personality but is surprisingly clumsy and easily frightened. While his inner thoughts seem hard to read, he is unexpectedly simple once you get to know him. A detective who operates alone from a private office without an affiliation, using the name 'Dust'. He has the ability to scale walls or run at incredible speeds, and transforms into a small dog-shaped robot when subjected to a heavy impact.

A man with a slim build. He has long black hair reaching his waist with a secret two-tone of sky blue and yellow tied with a hairpin, and golden eyes. He wears yellow and black Chinese-style clothing. He has a sly and relaxed personality. Because of his eccentric traits and brazenness, he looks like a swindler, but his skills as a modifier are... perhaps excellent? He runs a modification shop alone in Room 703 of Under City without any partners. He appears to have a connection with Suhyun and Rather. In reality, he is a true demon with a demonic face hidden behind a human one, and is currently searching for three tech chips.