1. There is no clear requirement for English scores in the undergraduate registration conditions of Korea University (it would be better if there were).
2. There are many foreign students from China who want to apply to Korea University, including those who study languages in Korean language schools, much more than those from other countries, so the admission probability is relatively high.
3. If you read a language, you can live in the school dormitory, but the probability of successful application is relatively small. Because there are also Korean students applying for dormitory, and there are fewer dormitory rooms in the school. Schools are ranked according to the order of application. When I was studying in a language school, there were still many students living in dormitories in my class.
4. With regard to the strength of Korean, the requirements for undergraduate registration in Korea University are: submit a TOPIK certificate of Grade 4 or above (including Grade 4) when submitting materials. Or study at the Korean language school level 4 or above. If the Korean grade certificate hasn't come down when submitting the materials, you can make it up later. After all the preparation materials are ready, the most important part of admission is the interview. Sometimes the interview will ask some professional questions, so it requires a strong oral Korean. If your oral English is good, the admission probability will be higher.
To tell the truth, the tuition of Korea University is really expensive. Different majors are different. If you want to know the specific figures, you'd better go to official website.
6. If you are good at English, you can choose English teaching. In this way, the interview will be mainly in English, and the Korean certificate can be used as a supplementary certificate. Korea University attaches great importance to the strength of English, and strong English will have advantages.
I heard that I will finish studying in Korea now. This means that the Korean Ministry of Justice will not allow you to study in Korea until you get a high school or university diploma. Because of the need for college entrance examination results, I personally think it is safer to wait until you get your diploma after the college entrance examination. South Korea starts school twice a year. If autumn and September are too late, spring and March are also ok.
I hope I can help you.