"The Poisonous Doctor and the Crazy Concubine: Your Majesty, I Will Guard Your Country" is an ancient romance novel that combines elements of time travel, medical skills, intrigue and palace fighting. The work tells the legendary story of a top modern poison medicine expert who accidentally traveled through time and became a bullied concubine in an ancient prince's palace. With his extraordinary medical skills and poison-using skills, he managed step by step in the crisis-ridden palace and court, and finally joined hands with the sinister and weak young emperor to protect the country and turn things around.