Step 1

Combine kimchi, kimchi brine, gochujang, sugar (if used), garlic, and sesame oil in a large bowl. Mix well with a spoon.

Step 2

Bring a pot of water to a boil and add the noodles. Stir them with a wooden spoon and cover. Cook for about 3 minutes 30 seconds. Only a minute into the cooking, it may start boiling over. Just stir the noodles and crack the lid. Taste a sample to see if the noodles are nicely cooked or not. The noodles should be chewy but without anything hard inside. Drain the noodles in a strainer and rinse them in cold running water until they are cold and no longer slippery. Drain well and add to the kimchi mixture.

Step 3

Mix everything well and transfer to a large bowl. Add the cucumber and the egg and sprinkle some sesame seeds over top. Serve right away.