In a medium saucepan, bring water to a rolling boil over high heat. Gently add your medium-sized eggs and boil for exactly 6 minutes.

Immediately transfer your boiled eggs to an ice bath in a bowl filled with ice and cold water. Let them cool for approximately 5 minutes.

Carefully peel your eggs under running water to minimize breakage.

In a mixing bowl, combine soy sauce, minced garlic, chili, brown sugar, and sesame oil. Stir until the sugar is fully dissolved.

Place the peeled eggs in an airtight container and pour the marinade over the eggs until completely submerged.

Refrigerate the marinated eggs for at least 6 hours, preferably overnight.