He, Yin Yuyin, is an evil, arrogant and lonely person. He, Yin Yuyang, is a person who lives by revenge but fights for love. He, Yu Shuming, a once gentle person, has become cold, well-behaved but reclusive due to amnesia. She, Ling Huiya, was a fragile person who was cold at first, but later was deeply moved... A love with twists and turns, an incredible subtle transformation, a love song between love and helplessness... It turned out that everything was just because of a stubborn word.