Helpless is a South Korean thriller that follows the story of a woman named Seo-yeon, who is set to marry her fiancé, but finds herself unraveling the mystery of his disappearance shortly before their wedding. As she delves deeper into the investigation, she uncovers unsettling truths about his past and the potential dangers that lurk in the shadows. The film explores themes of trust, betrayal, and the lengths one will go to for love, leading to a shocking climax that reveals the complexity of human relationships.