Let's compile a list of people who are known to be undefeated up to a certain point.
-In HSDS, Reverend Kongxing was undefeated until he met Zhang Wuji. In fact he defeated all of his previous opponents quite easily.
-Jiumozhi was undefeated until he met Xuzhu
-Xiao Feng was undeafeated until he met Sweeper Monk
Please contribute your knowledge.