none, you are allowed to drop a course during semester.
▶ Abandonment of registered course
  - Who can apply : Students who registered more than 2 courses
  - When can apply : In the early of May and November (Check Academic Calendar)
  - How to apply : Log in the INHA portal (http://portal.inha.ac.kr) > go to INS(학사행정) > Courses(Graduate) > select the abandonment of registered course
  ※ At least one subject must remain for your academic activities.
  * For detailed information, visit Academics > Course Registration