I wonder how good your Korean is. Designers should communicate with customers. If there is no problem in your Korean communication, there will be no big difficulty.

1. If you are not Korean, you are basically looking for a company. If a company wants you, you will get a visa, but it is very difficult for you, unless you find a Korean woman to get married in a fake way, but it is highly technical.

2. Find a job on the website, or ask your Korean friends to hand in their resumes.

Just learn Korean well, nothing else. After coming, it's good to participate in a free Korean study program of the Ministry of Justice and get to know Korea.