Who Is She S01E12 - A Flower That Never Fully Bloomed

Mal Sun has to choose between returning to her old self or living as Doo Ri but disappearing after six months. Her twin sister Kkeut Sun comes back to her, and Mal Sun realises that she was in fact Emily. Mal Sun contemplates before making her final decision as she can't imagine not being able to live as Ji Suk's mother. Right then, Ji Suk tells her something that helps her make a decision.