Before he travelled through time, he was in charge of a case involving the theft of cultural relics. He had some understanding of history and knew that Sun Fugua was demoted to the Ministry of Punishment in the fifth year of Zhenguan due to a wrongful conviction.,This meant that even after crossing over, he still needed to deduce things based on clues just like he did in his past life.,The jailer asked suspiciously, "Why do you have a red handprint on the back of your head"。