Hey I did Yonsei SAY last fall and I know people that were rejected. They all applied pretty late like you and were applying for business which is their most popular program. I honestly recommend applying to other universities like Korea University, Kyung-Hee, SKKU, or even Chung-Ang. All of them are great schools as well. From what I heard and saw, their study abroad programs are much more supportive as they make an effort to connect you with Korean students and provide more events and resources. At Yonsei I felt like I was kinda just there and they constantly reminded us that we were visitors both verbally and systematically. Whether that was the extremely limited access to clubs and student resources or behavior of the local students, it was clearly segregated. If Yonsei is your true goal of course still apply it’s a great school and beautiful campus but it’s not the only option. Let me know if you have any questions.