Siheyuan: The Gu System, Learning Gu in Secret to Succeed

The protagonist transmigrates into Cai Quanwu and gets bound to a Gu-Raising System. By copying other people's skills with the Skill-Stealing Gu, he masters superb medical skills from the start. His abilities win him everyone's favor, and he leaves his humble life behind to begin an entirely new life of boundless success.