Chop up your scallion, onion, pepper (smaller pieces), squash into bite size bits.
In the bottom of an empty pot, add sesame oil and vegetable oil.
Add scallion and onion and cook until fragrant in medium heat (if you want to add meat, this is where you add pork or beef and pan fry).
Add 1 - 1 ½ Tbsp gochugaru (depends on how spicy you want it) and fry until infused in the oil. Mix in sugar, oyster sauce, and soy sauce.
Then add 1 ½ cups water.
For a deeper flavor, you can add 2 cups of anchovy broth (+ mushroom, dashi if you have) boiled in advance.
Now bring to full boil, then add the squash, garlic, and pepper.
Add the silken tofu in the end and boil 3 minutes.
Turn off heat and add egg, then serve when the egg is almost poached. Enjoy with a bowl of rice!