Use a butcher's knife to roughly chop the shrimp (I like to leave some bigger pieces so you get pops of shrimp in each wonton). Transfer to a medium bowl.
Add the ground pork, scallions, oyster sauce, toasted sesame oil, sugar, salt, white pepper, and cornstarch. Mix until combined and let marinate for 10 minutes.
Set up your workstation for folding the wontons. Get a nonstick baking sheet to hold the wrapped wontons, a little bowl of water for sealing the wontons, and of course the wonton wrappers.
To fold a wonton, place a wrapper flat on your hand. Add 2-3 teaspoons of filling to the center and fold the wrapper in half to form a rectangle. Wet one corner on the folded side with water. Bring the two folded corners together and pinch to seal. Place the wrapped wonton on the baking sheet.
To cook the wontons, bring 8 cups of water to a boil. Add the soy sauce, Shaoxing wine, sugar, chicken bouillon powder, and MSG. Reduce the heat to medium, then add enough wontons to fill the pot. Cook for 5-6 minutes until the wontons float. Transfer into serving bowls and top with scallions and chili oil.