Miss Night and Day — Characters & Cast

Secure stable employment and restore her self-respect.

Begins as an anxious, demoralized test-taker crushed by repeated failures. Through her daytime trials, she discovers her inner resilience, solves her family's greatest tragedy, and finally pursues civil service with authentic confidence.

Conceal her identity while succeeding at work and catching the killer.

Mi-jin's daytime physical manifestation. Starts as a clumsy disguise to survive the workday, but evolves into a legendary all-rounder workplace figure who bridges generational gaps and breaks office prejudices.

Uncover the truth behind the cold case murders and protect those he loves.

A traumatized, workaholic prosecutor haunted by his mother’s disappearance. Softens his abrasive nature through his interactions with Lim Sun and Mi-jin, learning to open his heart and embrace emotional healing.

Find peace of mind away from public scrutiny and support Mi-jin.

A top idol doing public service duty after a drug controversy. He discovers Lim Sun’s secret early on, becoming her protector, confidant, and emotional anchor without judgment.

Support Ji-ung’s cases and keep the prosecution office afloat.

Ji-ung’s dedicated investigator who frequently finds himself baffled by Lim Sun's superhuman office antics and Ji-ung’s strange behavioral shifts.