Boil both ramen noodles with both packets of dried vegetable flakes for about 3 minutes, until slightly firm. Reserve 180 ml of cooking water, then drain.
Heat a little oil in a pan over medium heat. Stir-fry the onion and green onion for 1–2 minutes, then add the shrimp and cook until done.
Add all the Jin Jjampong liquid seasoning and half of the Jin Ramen powder seasoning. Stir well.
Add the reserved cooking water and noodles. Toss over medium heat for 1–2 minutes. Taste and add more Jin Ramen powder seasoning if needed.
Stir in the Jin Jjampong finishing oil and serve hot.