독불장군

Etymology
. The term appears to have originally been a chengyu-type proverb, but was turned into a noun describing the people the proverb would have been used for.

Noun

 * 1) a stubborn, obstinate fellow; a fellow who always insists they are right
 * 2)  a lonely outcast
 * 1)  a lonely outcast
 * 1)  a lonely outcast