Is there a peaceful or non-peaceful way to change leaders in North Korea?

Answer 1

It appears to be without civil unrest but it is a dynasty -- each leader is the son of the previous leader.

If you are asking if there's a way outside agents could change a current leader, not without war.

Answer 2

The internal structure of North Korean politics is not very understood. The Supreme Leader comes to power dynastically, e.g. when a Supreme Leader dies, his son succeeds him. However, there is a large amount of power wielded by the generals in the North Korean Army and there are likely some bureaucrats who also wield power. Some of their ascension may be meritocratic, e.g. they rise because they do their job well, some may be nepotistic, e.g. they rise because of who they are related to or are friends to, and some may be cronyist, e.g. they rise as a favor from one influential group to another. However, we know that there is violence involved when there are power struggle.

In terms of the North Korean people and/or foreigners wanting to change the Korean government, this could happen exclusively through violence. The only peaceful possibility I could imagine would be some reconciliation with South Korea that would result in a power shift in North Korea, but this is almost impossible.