Cloud Dynasty: Li Yan Ci

A modern special operations commander is unexpectedly transported into the Cloud Dynasty, becoming Li Yan Ci, a man trapped in a death cell. A forged secret letter lies before him, and the Grand Tutor presses forward, intent on wiping out the Li family entirely. His battlefield-honed strategic mind and crisis anticipation from his past life become his greatest assets for a desperate comeback. Within the prison, undercurrents surge, and various factions in the court watch for opportunities. The northern frontier is about to ignite, the south hides mysteries, and the web of schemes woven by corrupt officials tightens layer by layer. Using the art of war to counter court intrigues, Li Yan Ci plays his game from the imperial prison, breaking through schemes, tearing apart the Grand Tutor's ambitions, protecting the Li family, and stabilizing the turbulent realm of Cloud Dynasty. — Description from novelcodex.org