During the Republic of China era, Shen Mo, a mounter at Jiangcheng's Moxiang Studio, accidentally acquired a lost ink treasure of the previous dynasty, "Rivers and Mountains Rain and Mist Map", but discovered during restoration that the paper interlayer contained hidden marks, suspected of concealing a shocking secret. To protect the authentic piece, he teamed up with calligraphic and painting appraiser Lin Xue, engaging in a back-and-forth with Zhao Siye, a black-hearted antique dealer coveting the ancient painting. Through appraising ink, solving seals, and restoring layers of mysteries, they finally exposed a patriotic poem deliberately concealed within the painting, letting the national integrity reappear to the world. This work contains AI-generated content.