Repay Your Yin Debt, Keeper of the Dead

(Left zero, right fire, Thunder God, help me! Left yin, right yang, tear evil spirits apart with my bare hands!) My name is Lin Gu. My ancestors were originally Yin Wardens appointed by King Yama. My great-grandfather broke a contract, saddling the next three generations with a debt to the yin and yang! And I'm the last one left to pay it!