Teaching Chinese as a foreign language is aimed at its major. No students from other departments learn this course as a foreign language. However, if the time of your own class does not conflict with the time of teaching Chinese as a foreign language, you can sit in and the teacher will not drive you away. After you register your information after the start of school, you can find all the professional courses of all grades in the educational administration system.

By the way, undergraduates don't have double degrees.

I hope I can help you and wish you success in your studies ~!