Plastic surgeon Su Tang was forced to sign a contract marriage with Gu Jingshen, the president of Gu Group, in order to treat his sister who had leukemia. After the marriage, it was discovered that Gu's Medical Group was suspected of illegal transactions, and his sister's condition was actually related to the group's genetic experiments. During the day, she plays the role of a gentle young lady to gain trust, and at night, she transforms into a "black swan", using her advanced hacking abilities to infiltrate the group and collect evidence. In her revenge, she unexpectedly learns that she is the illegitimate daughter of the founder of the Gu family, and that Gu Jingshen is the half-brother. She eventually reveals the truth, disintegrates the business empire, heals her sister, and achieves female independence.
