The twin sisters who were supposed to be the closest to each other took different paths after their parents divorced. The elder sister became dark and cold-blooded, and would do anything to achieve her goals, while the younger sister was kind and simple, and had been taking care of her seriously ill mother. The temptation of money and power, and a seemingly joking marriage, closely linked the fate of several people together. The younger sister wanted to be a simple substitute for her elder sister, but she didn't expect that her life would never be peaceful from then on. The repeated conspiracies and coercion from her relatives eventually pulled her into this increasingly large conspiracy vortex.