"The Key" is a 2018 film directed by Jae-kyoo Lee, blending elements of drama and mystery. The story revolves around a young woman who discovers a mysterious key that unlocks secrets about her family's past. As she delves deeper, she uncovers hidden truths that challenge her understanding of her identity and relationships. The film features a strong cast, including Kim Ji-won and Lee Joon-gi, who deliver compelling performances. With its engaging plot and emotional depth, "The Key" explores themes of memory, loss, and the quest for self-discovery, making it a thought-provoking cinematic experience.