Cut the cucumbers in half lengthwise. Add the cucumber to a large resealable plastic bag. Use a rolling pin to smash the cucumbers into bite size pieces.
Let cucumbers sit.
Add the cucumber pieces to a colander and toss with the salt and sugar. Let sit for at least 30 minutes to let the cucumbers drain.
Make the sauce.
In a small bowl whisk together the rice vinegar, sesame oil, soy sauce, garlic and red pepper.
Assemble and serve.
Add the cucumbers to a large bowl and toss with the dressing. Top with the sesame seeds and cilantro and serve.