Dear Mohamed Kargbo,
Thanks for contacting Top China Travel!
If you are Chinese passport holder then you need to apply for a visa to South Korea, if you are foreigner, then you should check if your country have visa-free policy with South Korea. And, we are only doing inbound travel business in China, so I am afraid that we can not help with the details of trip to South Korea.
Any further request or question, please feel free to contact with us.