The Mad Sister 2

Genius Mercy Diamond was born an only child, longing for a sibling. Her parents were cruel—her father, a medical doctor, had affairs, while her mother, a former prostitute, was uninspired and lonely until the birth of baby Roxy, who became Mercy's world. However, when 5-year-old Roxy tragically perished in a house fire, Mercy's grief and need for justice drove her to excel in medical school. Mercy, fueled by the loss of her beloved sister, subsequently became a terror on the medical scene. With that, she used her Ivy-league medical training to create a fierce robotic tribute to Roxy. Unloved and craving attention, Mercy was determined to avenge her sister's untimely death.