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The series is a revenge thriller that follows a woman whose perfect life is upended when her lost memories return. Series Overview Revenge, Thriller, Melodrama.

Tae-ra visits the hospital where she suspects her past began and starts to remember her identity as the elite assassin known as "Number 50."

Hong Tae-ra (played by Lee Ji-ah) lives a seemingly perfect life with her successful husband and young daughter. However, she has no memory of her past. When her memories finally resurface, she realizes she was a highly trained killer and seeks to protect her family while getting revenge on those responsible for her trauma. Episode 2 Synopsis

The episode explores the rift between Tae-ra and her sister, and the growing suspicion from her friend Go Hae-soo, whose own father was assassinated years prior—a crime Tae-ra may have been involved in. Technical Details of the File