The male lead designs for the female lead to marry him so he can seize power, but on the eve of their wedding, she learns she is merely a substitute. The second female lead grew up with the male lead, but a misunderstanding makes him turn his love for her into hatred, and he falls for Shen Tang, an antagonistic palace maid. The female lead and the second female lead spend their lives fighting each other, only to realize on the brink of death that they have been paving the way for someone else. Given a second chance at life, the two women join forces to take revenge.
