In order to save his seriously ill sister, veteran Lu Yan resolutely bid farewell to the military and returned to the city. Under the heavy pressure of life, he still has not lost his true qualities as a soldier. When he bravely acted for justice and was in danger, the sleeping blood of cultivation in his body unexpectedly awakened. The iron-blooded responsibility and the power of cultivation are intertwined. He not only has to raise huge medical expenses to protect his sister, but also explores the secrets of blood. Since then, he has been involved in the urban undercurrent, splitting thorns with his fists and mystical skills, and starting a legendary road of protection and counterattack.