Broken Cavalier

You are a novelist, and you come to the rumored haunted castle with netizens to find inspiration. You are not like an ordinary person who has received aristocratic etiquette education, an ancient castle that has been warned against stepping on many occasions, and a diary that is broken. Uncover the conspiracy behind the perfect marriage in history for you, can the broken glass knight be repaired? Can a marriage like a broken mirror be reconciled? It's all up to you! Welcome to Castle Howard...