The Trash Comes Back for Revenge (Regresser! Cale)

Kim Rok Soo never became Cale Henituse as Cale has regressed. Cale has lived through the war and has reverted to the past with the help of the God of Death who takes pity on him. In this life, Cale has taken the knowledge from his past life to this new one in which he is back in his 18-year-old body right before Ron and Beacrox leave. How will Cale get back at Arm, his mortal enemy, in this life where he knows almost everything from the war? Only time will tell.
Credits to the artist and to Yoo Ryeo Han