My Kingdom - are we fated or doomed?

The harmony between the three kingdoms of Taixu, Minghuo and Qingse seems to be severely tested. To ward off the threat of Taixu, the ruler of the Minghuo kingdom decides to put aside hostilities towards the Qingse tribe and to force his son - the crown prince - to marry the younger sister of the tribal chief, to seal an agreement between the two peoples.