On a rainy night, as he begins writing, a gray mark suddenly appears in an empty line of the Jade Register. A greenwood waist token accidentally opens a hidden door, revealing a secret stairway in the Drum Tower. The new student Shen Yan enters the National Academy's Arcane Arts Hall and discovers that the academy has sealed away secret arcane scrolls under the guise of ritual propriety, maintaining a fragile balance between the mortal and spirit realms beneath layers of hidden texts. Before the Three Seals are settled, the mystery of the register and missing lines on the wall notices emerge one after another. Between rules and consequences, the young man learns to choose: first close the door, then uncover the truth.
