Cut ends off cucumbers, and cut into pieces (about 3” long).
On a cutting board, place a piece of cucumber with chopsticks on either side. Using a sharp knife, cut straight down to the chopstick (not all the way through).
Flip the cucumber piece to the other side and cut down at a 45 degree angle, down to the chopstick. Repeat with all cucumber pieces. Alternatively, slice cucumbers into thin rounds, or your desired shape.
In a large bowl, add sliced cucumbers and sprinkle salt. Cover cucumbers with water and set aside for 10 minutes.
After 10 minutes, drain water and return cucumbers to the bowl.
In a separate bowl, combine garlic, chili oil, rice vinegar, soy sauce, sesame oil, and sugar. Stir until the sugar is completely dissolved and ingredients are combined.
Add dressing mixture to cucumbers and toss to combine.
Garnish with sesame seeds and serve.
Notes
Make Korean cucumber salad up to a day ahead.
Refrigerate in a covered container up to four days.