1. You can't apply for Hony University until you get your diploma. Generally, school starts in March, and you should prepare the application materials in September, and submit them around 10/1.
2. Korea takes a fancy to English. If you want to go to graduate school, you'd better have TOEFL or IELTS scores. If your English is not good, you'd better pass TOPIK 5. If you can't reach Grade 5, you have to go to the language school there first.
Hony hung university is the best art in Korea, unless your major is very good, it is difficult to get into it. Usually such a good school, the intermediary will not recommend it, because they are not completely sure to let you in, so it's hard to say. If the general school accepts you, the principal will guarantee you a visa, and there will be no problem. Don't worry.
4. If it is Hongyida, it is ok, because the applicant is required to stay in Korea for three months, and then there will be an evaluation. You should make sure that your major is very good.
5. If you have a foundation, you'd better take the TOPIK exam directly in your country. Generally, some Korean schools require you to enter school before you can take the exam. Hony University is an art major, so you should be more relaxed.
I don't know much about Wuhan.
7. It depends on what kind of job you are engaged in. I can't work immediately after I go there. When the government allows you to stay for about three to six months, you can only take a part-time job. Moreover, the tuition of Hony University is very expensive, at least about 56,000 yuan a year. There may be some differences between majors, but there are 50% scholarships. If your major is good, you can get a scholarship every year, and you should be able to work and study.