Just Went to Jail and Dug up a Murder Case from Twenty Years Ago.

Jiang Che, the top scorer in the provincial examination, was assigned to the most remote prison. A colleague advised him: "Long San has had three corrections in three years, so don't touch him." He didn't believe it. Others use batons, he uses psychological profiling. Others put him in solitary confinement, but his blood lead concentration was found to be excessive. For three months, the most difficult felons took the initiative to sign up for a skills competition. But the real battlefield is beyond the walls. A green dossier left by his father involves a bizarre suicide case twenty-six years ago. The prisoner "died" of illness the day after the commutation was announced. The names in the file that were erased by correction fluid remain unknown to this day. When the truth behind the iron gate is revealed inch by inch—— He found that what he was pursuing was not just his father's death. There are also everyone's secrets that have been buried in this prison for twenty years.