Baek Su-jeong leads a planning team at a renowned department store. She meets her new boss, Ban Ju-yeon, her first love from an online game 16 years ago, stirring up memories of when he confessed his feelings but she rejected him.

Woo Jin and Samuel, a sexless married couple, are utterly fed up with their lives. To improve their circumstances, they choose to earn money by blackmailing unfaithful couples. As they track down these couples, they find financial stability and rediscover their own connection. They start working on their own issues, but the more they delve into it, the hidden truth resurfaces, complicating their journey. What is the truth that they have been avoiding?

Da-kyung, a horror YouTuber desperate for views, uploads a video about the eerie urban legends surrounding Gwanglim Station—the site of the highest number of missing person cases in the country. The video goes viral overnight. Despite everyone's warnings, Da-kyung's thirst for views only grows stronger. But as she digs deeper, she uncovers a shocking secret behind the station…