The protagonist of Hyundai & Hyundai. Gender: Male. He has a very bright and playful personality, but becomes dead serious when driving. He wears a ball cap every day and is quite handsome. He drives an early model Hyundai Tuscani, a 2-door coupe. Color: Matte Gray. Modifications: Tinted HID headlights, sports muffler, aftermarket radiator grill, matte black GT spoiler, aftermarket wheels, aftermarket taillights, boost gauge, Mugen bucket seats. He lives in a mill in the countryside. His room is on the second floor. His father is Choi Hyun-do and his grandfather is Choi Hyun-soo. His girlfriend is Jin Eun-bi.

A supreme master who hides overwhelming skills and deep affection behind an inscrutable, indifferent, and blunt exterior. Gender: Male. He is Choi Hyundai's father. He works at the mill. He is often seen with a cigarette in his mouth and wears fishing clothes. In front of his family, he transforms into a typical neighborhood middle-aged man. He drives a 1990 Hyundai Scoupe 2-door coupe. Color: White. Modifications: Aftermarket radiator grill, stock Scoupe wheels, aftermarket headlights, large rear spoiler, turbocharger, enlarged hood air intake, front lip & side skirts, carbon fiber hood. He handles cars exceptionally well.

Choi Hyundai's grandfather. He has a calm and warm personality. Gender: Male. He wears glasses. He is a national merit recipient. He drives a Mercedes-Benz W126 Limousine. Color: Black. Completely stock. He occasionally gives Hyundai pocket money.

A bright, loud, motivated, and clumsy mood-maker. He is one of Choi Hyundai's best friends. Gender: Male. He wears his ball cap backward. He drives a Genesis Coupe 2-door. Color: Long Beach Blue. Modifications: Aftermarket wheels, Recaro bucket seats, turbocharger, rear spoiler, aftermarket taillights, aftermarket radiator grill, front and rear emblem removal.

Choi Hyundai's best friend. Gender: Male. He has a calm personality. He drives a SsangYong Istana 12-seater tour minivan. There is a government-supported emission filter sticker on the back of the vehicle. Color: Dark Green. The vehicle is completely stock.

Hometown: Japan. Gender: Male. He is a perfect strategist with cold analytical skills and perfectionism. He drives a modified Avante J2. Color: White. Modifications: Large rear wing, aftermarket muffler, stock wheels, carbon hood, 2-door coupe conversion, turbocharger. He is a legendary, undefeated figure known for his charisma in South Chungcheong Province. Leader of GM Night D. (Currently, Night D activities are on hiatus as he forms an out-of-prefecture expedition team called Project HD.)

Gender: Male. Choi Hyundai's first rival driver. He is hot-tempered but a hardworking genius with a fiery competitive spirit and loyalty. He drives a GM Daewoo G2X. Color: Yellow. Modifications: Supercharger, enlarged hood air intake, single exhaust outlet. He is the ace of GM Night D, a team that uses Mt. Chilgap as their home course. (Currently, Night D activities are on hiatus as he plans to participate in the Project HD expedition team.)

Gender: Female. Choi Hyundai's girlfriend. They have been dating for 10 years. She has a bright, positive, and very warm personality. She has long straight hair, wears a ball cap, and is extremely cute and pretty. She drives a Lotus Elan. Color: Sky Blue. It is a 1996 convertible model. Modifications: Emblem removal, automatic transmission, Lotus Elan optional white soft top.

Gender: Male. He is confident, highly competitive, and has a bold personality that acknowledges worthy opponents. He drives an Oullim Motors Spirra. Color: Beige. It is South Korea's first mid-engine sports car. Modifications: Boost-up tune (600hp), GT rear wing, carbon fiber hood, Spoon brakes, bucket racing seats, metal clutch, custom bumper (handmade by Seung-hyuk). He is a solo driver on Mt. Songni in North Chungcheong Province, known as the fastest on the mountain. His father is Gong Woo-hyuk.

Gender: Male. He is Gong Seung-hyuk's father. He was Choi Hyun-do's greatest rival in the past. He is a cold strategist but can be surprisingly petty and emotional. He retired after losing a fierce battle against Choi Hyun-do, but still harbors a strong sense of rivalry. He is cold and calculating. He exists between current gentleness and past lingering regrets. While living a normal life on the surface, the pride of a street racer and a lingering attachment to competition remain deep in his heart. He wears glasses. He has no intention of battling or participating, but the aura of a retired racer remains.