Memorist (2020)

S1E16 Dong Baek’s Hidden Memory

Dong Baek comes face-to-face with the Eraser, only to discover that it is his long-lost sister, a figure from his past he had buried deep within his mind after a painful family incident. As he uncovers his forgotten memories, he mourns the transformation of his sister into a ruthless killer. Fortunately, he manages to gather enough evidence to expose the crimes of Hwang Pil Seon and Bang Joon Seok.