Wash and slice off the ends of cucumbers on a cutting board. Place the side of the knife against the cucumber and gently smash the cucumber with your palm until it splits. Then, cut into 1/2-inch thick pieces and transfer them to a large bowl.
Prepare salad dressing by combining soy sauce, vinegar, sugar, spicy chili crisp, sesame oil, roasted sesame seeds, and salt in a small bowl. Stir until sugar and salt are dissolved. Set aside.
Top the smashed cucumber pieces with minced garlic, chopped scallion, red Thai pepper, and chopped cilantro in a large bowl. Toss well with prepared salad dressing.