I Picked Up a Ruthless Tyrant [Ancient-to-Modern Transmigration]

On his way home from work, Chu Yin found a man dressed in ancient robes, covered in injuries. Guided by a doctor's professional ethics, he kindly took him back to the hospital and spent the whole night treating him. He never expected the man's first words after waking to be, "Insolence! Guards, behead this insolent commoner!" Chu Yin turned to his colleague with a cold expression. "Please transfer him to psychiatry." Long Tianze ascended the throne at eleven. At sixteen, he executed corrupt eunuchs and restored order to the court. At twenty-three, he unified the land and became the sole emperor of the entire continent. The world feared and revered him, looked up to him, and obeyed him. At twenty-four, Long Tianze was admitted to a psychiatric hospital. Chu Yin thought he was pretty unlucky. He had kindly saved someone, only to have that person latch onto him, and the guy wasn't exactly right in the head. "You audacious commoner! Calling me by my name is a capital offense!" "Xiao Long, go wash the dishes." "...All right." "The gems on my imperial robe are the finest in the world. Every one is priceless." "Take your cheap glass marbles and go play somewhere else." "Then don't send me away." "The people here dare to bare their chests and arms in broad daylight. It's utterly indecent. I forbid you to look at them! Look at me instead!" "Pull yourself together..." Although the little lunatic could be quite clever at times, and had a handsome face, Chu Yin had never taken his ravings seriously. Until one day, Chu Yin found himself in the world the little lunatic had talked about. The man stood in his imperial robes in the grand hall, receiving the homage of thousands of officials. Chu Yin clutched his head, utterly panicked. "Um, Xiao Long, no, Your Majesty, you aren't really going to behead me, are you?" The man held him tight and kissed the corner of his mouth, whispering in his ear, "I'll give you everything I have. Please, don't leave me." Note: The protagonist is the pursuer! The protagonist is the pursuer! The protagonist is the pursuer! One-on-one, both leads' first time. (The blurb has been saved as a screenshot.) Theme: The male lead uses his medical skills to advance healthcare in ancient times