The Abyss of 100 Flowers (2011)

During 1930s Minguo in the nation's capital, opera performer Xiao Jun Sheng is arrested for the murders of five women at the peak of his career after a witness, Master Na, claimed to see him at one of the crime scenes. Jun Sheng is subsequently poisoned in jail with his death made to appear as a guilt-driven suicide, and his wife is forced to flee with their two young children. Eighteen years later, to carry out the final wish of their now departed mother, Ke Lan and Ming Xuan return to the capital to clear their father's name and uncover the truth. Ke Lan decides to enter the Na household as a servant while Ming Xuan joins the police force.