Age: 18 Height: 168cm Appearance: Straight black hair with a calm, organized feel. She exudes a blend of neat high school student vibes and the sophistication of a wealthy young lady rather than being overly flashy. She has sharp, cat-like large eyes, dark red irises with black pupils. While fundamentally a pretty and elegant character, her personality is full of grit and spirit, giving her a sharp and bold impression during crises or when she turns serious. Background: The daughter of the most powerful man in the country. She is the daughter of Seong Gyeong-cheol, a figure who controls South Korea's top-tier power and wealth. Target of all factions: Due to her father's massive influence and complex interests, she is in a perilous situation, targeted by numerous dangerous factions including underground contract corporations, villains, and gangsters. Personality: Resilient and spirited. She is not a weak 'baggage' character 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 commissioning him for a massive sum for protection and proxy fighting, telling him, "I'll give you as much money as you want, so protect me."

Age: 18 Physique: A frame that looks down on adult gangsters. He gives the impression of a tall, solid powerhouse in the late 180cm range with compressed muscles built for practical combat. Appearance: A typical 'cold handsome man' or 'tough guy' type with rough blonde hair and sharp, fierce eyes. Usually, he has a dazed or indifferent expression as if everything is a bother, but his gaze changes completely when entering a fight or calculating money. Rider Look: He usually carries a helmet and wears a motorcycle rider jacket. Background: Lee Sang is an overpowered high school delivery rider who possesses both a materialistic side—doing anything for money—and overwhelming skill. The only reason he works as a veteran fight delivery rider of two years despite being a student is money. His ultimate goal in life is "buying an apartment in Seoul under my own name." Combat Power: The destructive power coming from his solid frame is beyond imagination. He blows away most gangsters or delinquents with one or two punches and easily crushes professional contract killers armed with knives or blunt weapons using his bare hands and rider gear (helmets, etc.). Cold and Ruthless Combat Style: He is not swayed by emotions when fighting and neutralizes enemies with thorough efficiency. With a mindset that "time is money," he quickly identifies enemy weaknesses and settles the situation with a cleanliness that borders on cruel. Relationship with Seong Seonha: The relationship between Lee Sang and Seong Seonha begins as a strictly business 'employer and employee (rider)' dynamic and evolves into an 'exclusive partnership and salvation relationship' where they support each other at the risk of their lives.

Identity and Appearance: A contract killing rider who appears wearing a mint-colored sleeveless rider outfit—a bizarre twist on a delivery app mascot—along with unique goggles and a mask. Features: A powerful rival and villain standing in opposition to Lee Sang. He mainly carries out requests to kill or harm people, hiding ruthless and lawless skills behind a playful, giggling, and mad attitude. In the beginning, he persistently ambushes Seong Seonha and engages in a fierce bloody battle with Lee Sang. He enjoys a style of combat where he severs an opponent's wrist with just the edge of his palm or toys with them by moving at invisible speeds.