Undercovered Heart

Official listings include FlexTV.

Undercovered Heart is listed with 60 episodes.

Mary, a dedicated narcotics officer, is reeling from the brutal murder of her partner, whose death has been cleverly staged to appear as an overdose. Frustrated by her department's refusal to pursue the case as a homicide, Mary is driven by a fierce determination to avenge her partner’s death and bring down the notorious drug lord, James Sinclair. In a bold move, she goes undercover, infiltrating James's operation as his secretary. As she navigates the treacherous world of drug trafficking, Mary quickly discovers that James is not the heartless criminal she anticipated. Charismatic and complex, he operates under a façade that hides a darker world but also reveals unexpected layers of vulnerability and depth. As Mary gathers evidence against him, she quickly discovers that James is not the heartless criminal she anticipated. Charismatic and complex, he operates under a façade that hides a darker world—but also reveals unexpected layers of vulnerability and depth, she also forms a bond with James's young daughter, Lily, who is innocent and unaware of her father's criminal dealings. The two develop a genuine friendship, creating an emotional tug-of-war for Mary as she grows increasingly fond of the child. This relationship complicates her mission and deepens her internal conflict, blurring the lines between duty and affection...

Other useful title forms are 隐藏的心.