The story of how social media and messaging are instantly changing the life of a modern person. It's been several years since a 16-year-old posted a photo of his girlfriend in the general chat, hoping to show off to his friends. Now he has a happy adult life: work, friends, his fiancée Katya, who is about to marry him. But the Internet suddenly reminds him of teenage love, after which a chain of inexplicable mystical events occurs with Katya and her friends. The girl receives mysterious messages from her fiancé's ex. Thanks to them, his life becomes a nightmare.