I Am the Master and You Are the Servant

A deep kiss signed the contract between her and him. He said: "Give him blood and soul, and he will help her achieve her wish." She made up her mind and said: "Okay, my life is yours, and likewise, your life is mine... You cannot die before I complete my revenge." From then on, they all belonged to each other. Sima Shirley, the orphan of the Sima family, signed a contract with the devil at all costs in order to find out the enemy who destroyed her family and avenge her. Assas, the devil who signed a contract with Sima Shirley, besides being a devil, he is also... The four major families all have their own agendas, and Her Majesty the Queen, who is loyal to her, also has ulterior desires for her. Who is the real culprit in the family extermination incident?