diff --git a/lib/domains/abused.txt b/lib/domains/abused.txt
index d8147446ce..164b955a08 100644
--- a/lib/domains/abused.txt
+++ b/lib/domains/abused.txt
@@ -1329,4 +1329,5 @@ myu.universitecentrale.tn
 umbc.edu
 mail.fresnostate.edu
 sanluis.edu.ar
-bup.edu.bd
\ No newline at end of file
+bup.edu.bd
+o365.yonsei.ac.kr
\ No newline at end of file
diff --git a/lib/domains/kr/ac/yonsei.txt b/lib/domains/kr/ac/yonsei.txt
deleted file mode 100644
index bc86dbc36e..0000000000
--- a/lib/domains/kr/ac/yonsei.txt
+++ /dev/null
@@ -1 +0,0 @@
-Yonsei University