A Woman's Castle (1985)

Considered an idiot at the age of eight, Byeol-nyeo's parents have a hard time making a match for her, however they eventually make a contract with the parents of the equally young Ku-mu. Byeol-nyeo develops into a pretty and capable young woman and the elated Ku-mu marries her as promised, but his wife's beauty makes Ku-mu the target of a vicious plot by the envious men in the village.