I wanted to revenge my mother, but fell into a ZOMBIE love triangle?

Sun-Hi had to cut the head of her own mother. After the infected took over their tribe, the people left alive start starving. Only the royal palace was rumoured unaffected by the disease. The Emperor threw moldy bread in the mud outside of his walls. Her mother was infected while trying to get a piece. While watching her mother burning, Sun-Hi swore revenge. Contrary to the people beliefs, the whole royal palace was exterminated except the Emperor and his family. Between the infected running the streets, the Queen plotting, and the two princes fighting, would Sun-Hi be able to get the revenge for her mother or will love will find a cure so the world turns back to normal?