The Omega of the King

Livia was a beautiful omega who married the king, but was merely an extra in a story where he dies unjustly, accused of killing his own child while still in the womb. Now, Ryan has reincarnated into the young Livia, and unwilling to die unjustly, he decides to change his fate, starting by putting the king's concubines in their place, who constantly belittle him despite being the 'queen.' Ryan knows the king holds no affection for him, believing him to be a puppet of his family, whose goal is the throne.
However, the drastic change in Livia causes the king to start noticing him. Can Livia avoid his death? Why is the king now after him?