"Horror Queen Da-kyung" is a horror YouTuber who has a passion for ghost stories and the occult. However, despite her enthusiasm, her subscriber count is steadily dropping, so she is often ignored by her creative agency. As a result, she is looking for compelling real-life horror stories. Through Woo-jin, the only producer at her agency who supports her, Da-kyung meets the station master of 'Gwanglim Station,' where mysterious incidents are said to occur. The station master begins to share one strange incident after another that happened in the subway. As the channel based on these stories starts to soar in popularity, Da-kyung becomes increasingly obsessed with Gwanglim Station...