I Treat The Angel's Hair Problem After The World Merges

Lin Tian was a senior medical school graduate. After he fell walking down the road, he got up and found that the world had changed.
There were zombies, vampires, demons, ghosts, and even angels on the road?
"What kind of world is this?" In a panic, Lin Tian's brain awakened the healing system. "Congratulations, host, you've awakened the healing system, that gives the host the ability of all medical skills to treat a creature. You can get a random reward. The reward contains everything in the world, from booster abilities to starships and battle armor."
As soon as Lin Tian heard this, he immediately said to the zombie in front of him, "I am a doctor who can give you a facelift and restore your appearance. Don't eat me!"
From then on, Lin Tian embarked on the road of pulling teeth for zombies, treating vampires for blood-sickness, psychological counseling for demons, treating angels for feather removal, and so on.
There was no disease that Lin Tian couldn't cure. Lin Tian has now changed from a prey into a superstar, adored by each race. Every day, in front of Lin Tian's home, there would be seen a queue of creatures from the door to dozens of kilometers away.
One day, after Lin Tian gave the God of Death treatment for spine problems, he finally drew the starship he had wanted for a long time. "Goodbye!" He was going to the universe to start a new life! Lin Tian boarded the battleship, but before he flew out of the planet, he was stopped by the King of Demons, six-winged angels, Zombie King, Vampire King, and other leaders of all races.
They all yelled, "No way. What should we do if you leave? You are our only miracle doctor!"