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A bittersweet romantic comedy about a job seeker who suddenly gets stuck in time as an old-ager one day, and an extraordinary internship with a prosecutor who is caught up in her all day and night.
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.
After Ji-ung reacts unexpectedly to Mi-jin's move, she avoids him out of sheer embarrassment. Ji-ung decides to investigate a suspect in his own way.
The investigation into the hospital yields suspicious evidence. Ji-ung begins to feel uncomfortable about Mi-jin and Ko Won's relationship.
Baek Cheol-gyu looks into the connection between Sun and Mi-jin. During a raid at the hospital, Sun finds herself in a dangerous predicament.
Sun finds herself in a panic to save herself from Baek Cheol-gyu. But she later implores him for help when she realizes they may have a shared history.
As their romance blossoms, Mi-jin and Ji-ung navigate their complex relationship. Cheol-gyu requests a meeting with Sun to assist her with her request.
After Mi-jin oversleeps, she faces her family and Ji-ung as Sun — having to confront her secret. But soon, she deduces the identity of the killer.
As Mi-jin tries to save her father, she finds herself in danger — forcing Ji-ung to spring into action to track her down before it's too late.
With nothing left to hide, Mi-jin contemplates her future. After she testifies in her attacker's case, Mi-jin and Ji-ung reconsider their relationship.
