He was a wage slave in the twenty-first century. After accidentally drowning, he transmigrated to a parallel world, the Yan Kingdom, and became a fake eunuch in its imperial harem. He fell in love with one of the emperor's consorts and stirred up a storm in the palace.
He followed a prince into exile, founded the Great Xia, built guns and cannons, unified the four kingdoms, and forged a great empire...
