She fell in love with this man from the moment she was brought back to the palace by him when she was five years old, but what separated them was not only the fifteen years of age, but also a promise to an old friend. In order to be with him, she tried her best and tried every trick, but why did she still fall in love even if they truly loved each other? Unable to escape the test of life and death, her heart died the moment she saw the door of his tomb closed, but it was not the most painful ending. Only when she saw him again did she realize that she was the one who was being played. When everything became a dead end, how could they unravel this intricate chess game?