Mavka is a dangerous nymph of the forest lake that lure people into its depths for the mermaids to feed on their energy. When she meets Lukian, a biology whizz, Mavka falls in love disrupting the natural order.

女将木兰卸甲归乡，惊见母亡父死、弟被掳走。她深入黑矿救弟后，却目睹其弟惨死恶吏之手。在追查中，她逐步揭开雍州官商勾结的黑幕：恶霸刘焕私铸假币、残害百姓；州官嵇世勋表面赈灾，实则借军功之名盘剥乡里、杀良冒功。木兰孤身复仇，手刃刘焕；更识破嵇世勋伪善的面具，亦割其耳并押送天子处置，为民除害。最终她拜别父母家人，独自前行，誓…