I'm Dave. It Makes Sense to Grow Peashooters, Right?

This is a world where zombies are rampant! White zombies... Golden-haired zombies, flying zombies, non-bone zombies...! Warriors can move mountains and fill seas, but they are just like chickens and dogs in front of high-level zombies. The human race will suffer for a long time! "Doctor Dali, I seem to have been bitten by a zombie. Please help me!" "My little friend, I have been poisoned by corpse poison. Please put aside your past grudges and save my life!" "I would like to support Dr. Dali as the contemporary human emperor!" … Zombies are besieging the city, and only a mortal doctor can save the people from fire and water... "Studying medicine can't save Jiuxiao Continent, I'm going to give up medicine and work in farming!" Wang Dali's heart felt like water still... Zombies, right? I am a doctor who just happens to be able to grow some zombie killers. Studying medicine is just a side job, and farming is the way to go! (This book is also called "I Really Rely on Farming to Prove Immortality")