Wash the cucumbers thoroughly and cut them into pieces about 4-5cm long.
Slice the garlic and Cheongyang chili peppers into suitable sizes.
Neatly arrange the cucumber, garlic, and Cheongyang chili peppers in a sterilized glass jar.
In a pot, add soy sauce, water, sugar, vinegar, gochujang, and soju, and bring to a boil.
Once it starts boiling, turn off the heat after 2-3 minutes and let it cool.
Pour the cooled marinade into the glass jar, making sure all ingredients are submerged.
Close the lid and leave at room temperature for about a day, then store in the refrigerator.