무슨

Etymology
probably a hypercorrection of  that was motivated by the adnominal suffix  common in determiners.

Variants of with final, e.g.  and , remained more common than 므슨 or 무슨 until the mid-nineteenth century and are still used by some older speakers of  dialect.

Determiner

 * 1)  what, what kind of
 * 2)  a certain, some; some kind of
 * 3) what kind of;
 * 1) what kind of;
 * 1) what kind of;

Usage notes

 * and are both common in speech. In written form, only the latter is accepted.