Does Korea need a visa?

Need. China people travel to South Korea with Chinese mainland passports, except Jeju Island, which is visa-free. To go to other cities in Korea, such as Seoul and Busan, you need to apply for a Korean visa in advance. With a Korean visa, you can stay in Korea for 90 days (tourists with Chinese mainland passports can apply for visa-free entry to Jeju Island for 30 days, but they need a Korean visa to go to other parts of Korea).