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Proto Motors was established in 1997 by the couple Han-chul Kim and Ji-sun Choi. The company has forged partnerships with Hyundai Motor Company, Kia Motors, and GM Daewoo. In 2001, the company custom-made a convertible limousine for Cheongwadae (the Equus), the South Korean presidential residence.
Proto Motors introduced the Spirra (a production model of PS-ll) at the 4th Seoul Motor Show. In 2006, Proto Motors was acquired by Oullim Motors and the development of the Spirra was continued, and in 2010 Proto Motors introduced the first Korea-made supercar. In 2014, the Oullim Motors Spirra EV, the electric version of the Spirra, was introduced.
- "Oullim: Yet Another All-Electric Supercar, This One From South Korea". news.yahoo.com. Retrieved 2022-08-04.
- "The Supercar that eats 911s and Ferraris for Breakfast: Meet the Spirra EX #blogpost". Car Throttle. Retrieved 2022-08-04.
- "Proto Motors Develops Korea's First Supercar | Car News | Auto123". auto123.com. Retrieved 2022-08-04.