Both leads are pure and devoted + sweet romance + one-on-one
She is the beloved little princess of the Dragon Palace, frail and sickly since childhood. When she was young, she lost her mermaid pearl while saving someone. Now she sneaks away to find it. He is a cold and austere regent. Their unexpected encounter reveals to Su Nianhuan where the pearl is. She has no idea what love is; she only knows that she must share an intimate union with him to get it back.
Afterward, he takes her to the capital. She keeps trying to seduce him so she can reclaim the pearl, while he makes his feelings clear to her. Each approaches the other partly for personal gain, each believing the other is their prey. As they spend their days together, love quietly takes root in their hearts. Just as they think they will spend their lives hand in hand, he happens to discover her identity.
With the fate of all under heaven on one side and the person he loves on the other, what should he choose?
