Mangnyangtanggeon: Dokkaebi Gamtu

Mu-Won became a thief, following in his late father's footsteps. One night, while being pursued by the forces of the empire, he met a person whose identity he did not know. In a crisis situation, the suspect harassed him with ill-natured intentions and offered him a hat which could make his body transparent, and the only condition was that Mu-Won give him his body.
(Source: Lezhin, translated)
Note: Part of Lezhin's Jeollaeyahandonghwa (전래야한동화) Collection.