To make the ramen broth, heat a 2-quart saucepan and add the oil.
Sauté the ginger until aromatic. Then, add the garlic, white part of scallions, toasted sesame, and continue to sauté for another 30 seconds.
Next, add the water and kombu. Bring the mixture to a boil then lower the heat down and simmer for 2 to 3 minutes. This step is to cook the kombu and you can place a lid over in this step but do make sure that the broth is simmering.
Remove the kombu. I saved mine for a side dish.
Then, immerse the bottom of the sieve in the broth. Using the back of a spoon, stir and press the miso and dou ban jiang through the sieve until all is dissolved.
Add the noodle and soy sauce. Cook the noodle as directed on the package.
Right before the noodles turn al-dente, add the bok choy and cook until crisp-tender. Swirl in the milk and cook for another minute to warm up the milk.
Turn off the heat and transfer noodle to a bowl.
To serve, top it with corn, chopped scallions (green parts), a swirl of chile oil, and toasted sesame seeds.