In the High Martial Era, Xu Qingran, a girl from the bottom of society, is betrayed by the one she loves most. In her moment of despair, a mysterious veteran player 'Old Hand' Yu Mo unexpectedly awakens within her body. Yu Mo is thoroughly familiar with all dungeon rules; upon taking control of the body, she humiliates the faithless man and strikes down powerful figures with a sword, leading Xu Qingran onto the road of rising against all odds. Xu Qingran holds fast to the line of kindness, while Yu Mo pursues ruthless speedruns—their extreme contrasts constantly clash. To uncover the truth of her family, Xu Qingran forms a pact and cooperates with Yu Mo; they quell the crisis at the border mining district and move among the top forces.