Coughing Blood While Teaching, I Cough My Way Through a Hundred Thousand Soldiers

Li Yuan Ci transmigrates into the Tang Dynasty, poisoned and reduced to a sickly schoolteacher who gasps after every two steps and could cough up blood at any moment.

To activate the Eternal Imperial Mentor System and keep himself alive, he takes in a foolish rich boy who has run away from home as his disciple.

"Your father plays favorites? Then let's make him the Retired Emperor!"

"Come on, let your master teach you what it means to kill someone with science. See these gunpowder recipes and steam engine blueprints? Li Shimin pulled off the Xuanwu Gate Incident back then. Why can't you? Just do it!"

The foolish boy trembles with excitement. "Master, you are a genius! I'll go home and hang my father on the city wall right now!"

He thought it was all just talk, until the day a hundred thousand Turkic troops launched a surprise attack at the Wei River and crushed the little steam-powered wooden horse he'd made for his beloved daughter.

Watching his daughter cry, Li Yuan Ci wiped the black blood from the corner of his mouth and pulled a rusty Mo Dao from under the stove.

That day, the sickly man broke through the enemy formation alone and chopped off the Turkic Khagan's head for his daughter to kick around like a ball!

Not long afterward, Crown Prince Li Chengqian drove a steam tank through the palace gates.

Li Shimin was stunned and frantically searched for the mastermind behind the crown prince.

At last, he kicked open the courtyard gate and saw the man coughing blood as he repaired a wooden horse for his daughter. The emperor, renowned through the ages, dropped to his knees, tears streaming down his face.

"Big Brother! You took that poisoned arrow for me at Xuanwu Gate. So you didn't die after all!"