Heat a large pot of water, add salt, and boil pasta to al dente according to package instructions.
Meanwhile, cut bacon into small pieces, chop kimchi and mince garlic.
Place bacon in a large cold pan and turn on the heat to medium high. Cook until bacon is crispy and fat is rendered, about 5 minutes. Add minced garlic and cook until fragrant, about 1 minute. Add kimchi and stir fry until kimchi is reduced and browned, about 5 minutes. Reduce heat to medium and add cream, stir to combine and simmer for about 1-2 minutes until slightly reduced.
Reserve 1/4 cup of pasta water. Add cooked pasta to pan with cream sauce along with parmesan cheese. Toss to combine and add up to 1/4 cup pasta water to pan if the sauce is not coating the pasta. Remove from heat and serve topped with chopped green onion.