Chinese family adventure set in a past where humans co-existed among monsters in a harmonious world filled with joy. Later, when the humans become filled with greed and look to expand their surroundings, the monsters are forced to leave their homes and exile themselves to a place where they are left to live in peace. A young village mayor named Song Tianyin (Boran Jing) encounters the Monster Queen (Baihe Bai) having fled her own realm, and is surprised when he discovers that he is pregnant with her monster child. The pair then must embark on a quest to protect the child from the evil clutches of villains who seek to hunt monsters.