Yong-pal Has Returned(1983)

Original title: 돌아온 용팔이

Yong-pal returns from his grandmother's funeral with a video tape of her will to be played for his family. He is also carrying an invaluable, centuries-old, porcelain treasure. His back gets switched with that of a smuggler who immediately makes plans to sell off the artifact to the highest bidder. Yong-pal and his brother, Yong-chil, set out to recover the heirloom.