At the young age of sixteen, jimin was ordained to be king. his father had coached him on the proper ruling techniques, and so he had become the near mirror image of him. That is a good thing perhaps, considering the people loved the senior king park.
The only difference between the two was that jimin had to quench his slightly more angsty teen side and tendency to spend too much time with concubines in order to make sure the kingdom was at a consistent peak of success.
he's been doing a great job, with the mild benevolence of a meek king but a strict over-seeing of each happening in the kingdom.