Jade of the Eight Gates

Jucho, a government official manipulating the young king from behind, begins to express his ambition to oust the king and take real power and plots a ruse. Meanwhile, Handong, a member of the emperor's special unit Surajo, meets the boy Jinbaek in a village he entered to following the traces of his disappeared colleague, and learns that his colleague met his end in this village. These two people who fought with the people sent by Jucho knew that they needed eight jades to rescue Jinbaek's grandfather who was held hostage and to stop Jucho's ambition, they started the journey together...

(Source: Naver, translated)