After failing her interview and falling for a scam, Lee Mi-jin falls into a well and finds herself transformed, leaving her desperate to find a cure.

Mi-jin begins work at the Prosecution Service as Lim Sun, running into Gye Ji-ung again. He later investigates a crime scene that leads to a wild chase.

Mi-jin's brief encounter with the killer aids Ji-ung in his efforts to find him. Sun becomes Ko Won's source of comfort during his struggles at work.

Sun reports to duty in Ji-ung's office, where she tackles every test thrown her way. Ji-ung prepares Mi-jin for the dangers she may face as a witness.

Ji-ung looks further into Ko Won's attacker after suspecting something bigger afoot. Sun gets scolded by Ji-ung over a mistake — shaking her confidence.

Mi-jin faces a crisis as she begins to transform into Sun in front of Ji-ung. Later, they make progress in a drug case after confronting violent youths.

Ji-ung questions Mi-jin while Ko Won investigates Sun, both suspecting something's off. Sun encounters a dilemma when she gets drunk at a work outing.

Ji-ung tracks a suspicious person working within his office. Mi-jin, attempting to look into Ji-ung's document, shares an intimate moment with him.