The Abyss War God: Return from the Sea of Corpses

After Special Operations Commander Lu Chen died for his country, his soul drifted into the Great Wilderness, rising from a mountain of corpses and a sea of blood to become the awe-inspiring Abyss War God. When the nine stars shifted, he tore through time and space to return to the modern world, only to find his name already carved on a monument for fallen heroes. Unable to reunite with his family, unable to meet old friends, and with enemies from the Great Wilderness hot on his heels, he wields the Abyss Command Token to traverse between two worlds. He slays immortals and demons, resolves past ties, and mends regrets. Returning from the sea of corpses, nothing in the world can stop him! — Description from novelcodex.org