Ruler: Master of the Mask - Season 1 [Sub: Eng], Episode 12
Trailer
This drama revolves around Joseon, a country where its people suffer from corruption as they are manipulated by Pyunsoo hwe, a powerful organization that seeks to acquire wealth by limiting the supply of water of Joseon, but by the help of their Prince, Lee Sun, who fights in order to save his people by the supply of his love, GA - Eun.