Bring a medium pot of water to a boil and cook the noodles according to package directions until tender.

While the noodles cook, add the minced garlic, scallion whites, chili flakes, and sesame seeds into a heatproof serving bowl.

Heat the neutral oil in a small saucepan over medium-high heat until it begins to shimmer and smoke lightly.

Carefully pour the hot oil directly over the garlic, scallions, and chili flakes in the bowl to bloom the aromatics.

Stir in the soy sauce, black vinegar, and sugar until the seasoning dissolves completely.

Drain the cooked noodles thoroughly, transfer them into the bowl with the spiced oil, toss to coat evenly, and garnish with sliced scallion greens.