"The Case of the Ink Mark" reveals the shady story of the imperial examination. Transcript student Lin Yan discovered that the special writing brushes contained secrets, and each brush contained a secret order to change the scroll. He took the risk to change his bald pen and uncovered the dark web of tampering that had lasted for twenty years. From the clerk in charge to the deputy examiner, the chain of interests is bottomless. When the fake pen is exposed, the web of conspiracy suddenly tightens. Alone against the evil of the system, can he find the lost justice deep in the ink marks?