Fall in Love with the Ever-Changing Evil Princess

He is cold and evil, he grew up with her as a childhood sweetheart, he only smiles at her, and he gives everything to make her smile; he is gentle and cold, no one understands his heart, but she becomes the knight who protects her; he is fiery, and uses his heart as a protection No one knows, but she is the only one who hurts him. He wants to spend his whole life loving her and protecting her; she is ever-changing, cold, ruthless, bloodthirsty, gentle, warm, smart, sinister, demonic, unreasonable, beautiful and noble. Let's see how the heroine can win back the hearts of all the beautiful men. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.