依據當初「送不出去的國書」的歷史背景，清廷推動君主立憲並未成功，因此規劃B計畫，需要玩家分別在紫禁城中著名的三個地點：乾清宮、養心殿的三希堂以及漱芳齋的多寶格，尋找國書遺留下來的歷史碎片。將他們一一找出後復原成完整的國書，並順利將國書送出去完成B計畫。
According to the history, the Qing Dynasty did not become a constitutional monarchy. As a result, they created a Plan B.
The player is asked to look for the broken pieces of the Letters of Credence in three famous spots of the Forbidden City: the Palace of Heavenly Purity 乾清宮, the Sanxitang 三希堂 of the Hall of Mental Cultivation 養心殿 and the Miniature Curio Cabinets 多寶格 of the Shufangzhai 漱芳齋.
The pieces must be found and put together so the player can send these letters and finish the Plan B.