Thinly slice the cucumbers and place them in a bowl. Sprinkle with salt and let sit for 10–20 minutes to draw out excess moisture.
Meanwhile, in a separate bowl, mix together the garlic, green onion, gochugaru, soy sauce, sugar, rice vinegar, and sesame oil.
Rinse the cucumbers thoroughly, drain well, and pat dry with a paper towel.
Add the cucumbers to the sauce and toss until evenly coated.
Sprinkle with toasted sesame seeds.
Chill in the fridge until ready to serve.