From Death Row to Throne (English-dubbed)

The top assassin Liam time-traveled to ancient times and became a death row prisoner, but he activated the Kill Enemies to Get Stronger System. He made a comeback in the army, killing bad rich men, but was blamed by the imperial court. To break the deadlock, he pretended to defect to the enemy and worked with a female general Eleanor. Liam defeated the enemy leader in battle, and achieved great success. His high achievements shocked the ruler and were framed by the fatuous monarch. Ultimately, he killed the monarch and established himself as the new ruler.