Bring water to boil in a pot, soak the glass noodles in freshly boiled water until transparent.
Drain and refresh them in cold water, then drain. Set aside.
In a small bowl, mix together soy sauce, garlic, vinegar, sugar, sesame oil, cornstarch and red pepper flakes.
Set aside.
Heat oil in a pan over medium-high heat. Add scallops and season the tops with black pepper. Cook 2 mins, until gold brown. Flip over and cook 2 more mins, until 2nd side is golden brown.
Add soy sauce mix to pan and bring to a simmer, for 2 mins, until sauce thickens and scallops are cooked through and have an opaque colour.
Turn off heat and toss in the glass noodles.
Serve scallops over the glass noodles and top with scallions and chilli padi.