Okay so I need help picking a main~

I have a story set in a kingdom, the main will be a prince, the youngest of them all. In the beginning he feels insignificant because his mother is not a highly valued concubine and he is not given as much help so he is a bad fighter. He will start out wary about everything and easily angered about being compared to his brothers. He goes on an adventure as the leader and fails to gain respect and finds himself in a life or death situation. He has the capability to grow and learns how to be strong and a leader but he starts out really weak and unsure.

I dunno who would fit this though. I was thinking Taemin at first but something feels off, I think his character would conflict with what I am building. Any ideas for who you want to see in this role?