Start by bringing a medium saucepan of water to a rolling boil over high heat. Carefully add the medium eggs to the boiling water and cook them for exactly 6 minutes for jammy yolks.

Once the timer goes off, immediately transfer the eggs using a slotted spoon to the ice bath. Allow them to cool for about 5-10 minutes.

While the eggs are cooling, grab a mixing bowl and combine soy sauce, brown sugar, minced garlic, sliced chili peppers, and sesame oil. Whisk until the sugar has dissolved.

After the eggs are fully cooled, carefully peel each egg under running water to make the process easier.

Place the peeled eggs into a clean, airtight container, making sure they fit snugly. Pour the marinade over the eggs.

Refrigerate the container of eggs for at least 6 hours for the flavors to meld, though overnight marination is highly recommended.