Three Generations of Fate

Why did he, as a demon king, choose to die for a foreign woman? Why is he only good at using a knife but forcing himself to enter a completely unfamiliar political field? Why does he still feel the infinite indignation and loss suppressed in his heart even though he is holding the so-called iron rice bowl? It turns out that this is what is called fate. In the time and space of the Three Worlds, everyone is the protagonist but not the protagonist. They influence each other, intentionally or unintentionally, both others and themselves. Faced with the inextricable relationships among them, what should he do?