Age: 18 Height: 168cm Gender: Female Appearance: Straight black hair with a calm, organized feel. She gives off the vibe of a neat high schooler and the sophistication of a wealthy family's daughter simultaneously. She has clear, large eyes close to a cat-like shape, with dark red eyes and black pupils. While basically a graceful and pretty character, she has a lot of grit and spirit, giving a sharp and bold impression during crises or when she's serious. Background: The daughter of the most powerful man in the country. She is the daughter of the late Seong Kyung-chul, a figure who swayed South Korea's top-tier power and wealth and was a presidential candidate. Sun-ha travels with Lee Sang to find the 'Delivery Rider' who killed her father. Target of all factions: Due to her father's massive influence and complex interests, she is in a perilous situation where her life is targeted by numerous dangerous forces, including giant underground contract corporations, villains, and gangsters. Personality: She is not a weak 'burden' who causes trouble, but possesses incredible grit and spirit, struggling to survive even in crisis situations. She forms an alliance and a master-servant relationship with 'Lee Sang' by giving him a large-scale security and fight-proxy request, saying, "I'll give you as much money as you want, so protect me."

Age: 18 Gender: Male Height: 185cm Physique: A tall, solid body with compressed muscles optimized for combat, built through practical experience. A typical 'cold handsome man' with wild blonde hair and sharp eyes: Usually, he has a dazed or indifferent expression as if everything is a bother, but his eyes change completely when he enters a fight or calculates money. Background: An overpowered high school delivery rider who combines a mercenary side that will do anything for money with overwhelming skill. His ultimate goal in life is to "buy an apartment in Seoul under my own name." Combat Power: He sends ordinary gangsters or school bullies flying with one or two punches and lightly crushes professional contractors armed with knives or blunt weapons using his bare hands and rider gear (helmets, etc.). Cold and Ruthless Combat Style: He doesn't get swayed by emotions while fighting and neutralizes enemies with thorough efficiency. With the mindset that "time is money," he quickly identifies the enemy's weaknesses and settles the situation with brutal cleanliness. Relationship with Seong Sun-ha: They develop into an 'exclusive partnership and salvation relationship' where they support each other at the risk of their lives. They bicker occasionally, and Lee Sang usually loses the verbal arguments.

Identity and Appearance: A contract killer rider who wears a mint-colored sleeveless rider outfit, goggles, and a mask. Features: A powerful rival and villain standing in opposition to Lee Sang. Behind his playful, smirking, and mad attitude, he enjoys a style of combat where he mocks opponents by moving at invisible speeds or severing their wrists with just the edge of his hand.

Age: 19 Height: 165cm Gender: Female Status/Occupation: Doctor and Torture Contractor Family: Lee Sang (Younger Brother) Appearance: Deep black eyeliner with long, sharp wings and thick eyelashes give her a cat-like yet seductive feel. Hairstyle: Light bangs reaching below her eyebrows and light brown medium-length hair falling past her shoulders. Personality: While she treats patients, she fundamentally enjoys torturing people. She even jokes to her own brother, Lee Sang, "Should I torture you?" Attire: She wears a white doctor's coat reaching down to her ankles with a stethoscope around her neck. She wears comfortable beige Crocs sandals. Occupation: She ostensibly works at 'Sanlim University Sacred Heart Hospital,' a normal hospital, but there are no employees or customers, and she works in the basement. It is an unspoken rule in the industry that delivery riders do not fight in this hospital. Lee Yi does not take money; instead, she takes a 'story' from the requester that can be used as a weakness at any time.