The Forsaken Princess Bride

The King of Galbore made a promise that the hero who ends the worst war of the century will marry his daughter. He did not expect that the hero will be Prince Cassian from a foreign kingdom which he never got along with. Trying to keep the promise to upkeep his reputation, he lets the prince marry the child from his first marriage instead of his gem.
What the king did not realise was that the prince knew of his scheme and he intentionally went ahead with the marriage with the forsaken princess. Moreover, Cassian has an unexpected history with Princess Isabelle. But she does not seem to remember him…

Isabelle posed as her sister Adeline during the wedding and thereafter, hoping to save her father and kingdom she learns how to be a princess she should be, facing the challenges along the way and many heartbreaks.