Yang Changtian never thought that he'd lose a constant in his life, his long-time friend Hei Jingyou is attacked by some unknown assailants and disappears along with her master. The only indicator left of the struggle is a mysterious and enigmatic tiger token. 20 years later, while everyone is moving on. Yang Changtian still feels deep in his heart that she's still in this world. But unbeknownst to him, Hei Jingyou is always by his side, hidden in the shadows, helping him just as she did before. But why is she hiding? With Yang Changtian, let's embark on a journey to unravel the truth about the mysterious organisation that attacked Hei Jingyou. And let us also witness a story of ultimate devotion and love.