As the illegitimate child of House Flores, Irenea has been looked down on and mistreated all her life. When she learns that she is to marry the cursed "monster prince" Cesar, she quietly accepts her fate. However, Irenea is shocked to see that he is treated far worse than even a beast. Empathizing with Cesar and realizing that only she can help him, Irenea vows to give him a proper life—as a human. Yet with the whole world against them, can they ever find freedom and happiness?