My Master Left Me an Empire Before Vanishing

Eighteen years on the mountain, and now my master's gone—leaving me with a marriage contract, five gorgeous senior sisters who won't stop texting, and an international organization I didn't ask for. Oh, and I'm supposed to 'raise some hell' in the city below. No pressure. Just a country bumpkin with godlike skills, a fiancée who wants me dead, and enough secrets to topple kingdoms. Time to see what chaos looks like when a hidden master crashes into modern society.