For You, My Queen

After the King of Manniton Tribe dies due to a virus spread by a black magician in the tribe who planned with the neighboring kingdom, his successor Melody quickly takes over as Queen to save the tribe. However, since she is younger than the age criteria, the rule is to get married to someone within the tribe in case the successor isn't mature yet (Spoiler: she is very mature). So her mother arranges a marriage with a person named Kevin Karsh. They both forcefully get married without both of their will. Follow the story of Melody and Kevin as they conquer challenges and save their tribe in the end.