A country girl leaves the mountain by her master's order to call off an old engagement, but unexpectedly runs into her fiancé. Skilled in martial arts, medicine, and metaphysics, she acts as a fake lover to jointly deal with rivals' schemes and plots while uncovering her sealed family background. Through business games and conspiracy crises, the two gradually develop feelings from a contractual partnership. The girl finds her family members, finally lets go of the idea of breaking off the engagement, and reaps a fulfilled love.