Mix the cooked rice with the kimchi, green onion, soy, and oyster sauce. Heat a wok or large skillet over high heat. Add the oil to the wok. When it is smoking hot, add the onion. Cook for 1 minute, then add the carrot. Cook 1 more minute. Add the rice mixture. Spread the rice evenly around the pan. Cook for 1-2 minutes, browning the rice mixture, then stir. Repeat this process of browning and stirring for 8-10 minutes or until all the rice has been cooked.