Fei Ying originally thought she was lucky. From a wandering orphan girl, she became Prince De's favorite maid. She originally decided to be his medicine guide forever, but a sudden assassination caused her to fall off the cliff. Her previously lost memory was restored, but she forgot about him. Lovers turned out to be sworn enemies. The hand of fate is like turning gold into stone. He, who has already been honored as King Long, has his memory sealed by the golden needle. When we meet again, we don't recognize each other. Deeply in love but not knowing each other, she wanted to use him to avenge the bloodshed. What was once the purest and truest feeling in childhood turned into mutual conspiracy and harm. In the end, will they remember their unforgettable love, or will they be lost in hatred forever?