Lin Chen was shot during an anti-drug operation. When he woke up, he found himself in the Hangzhou Prison of the Southern Song Dynasty and became Lin Mo, a former judicial soldier awaiting trial. His predecessor was dismissed from his post for "accepting bribes from bandits and releasing key criminals privately" and was to be executed three days later.
Using criminal psychology analysis, Lin Mo pieced together the full story of the case from the jailer's mouth - this was a frame-up against him, with the purpose of covering up the truth about the theft of banknotes from the Hangzhou treasury.