Place sliced cucumbers in a large bowl and sprinkle evenly with sea salt; allow liquid to drain from cucumbers, about 15 minutes. Spoon cucumbers onto sheets of paper towels; wrap paper towels around cucumbers and wring out as much liquid as possible.
Mix rice vinegar, rice wine, sesame oil, honey, lemon juice, green onion, sesame seeds, walnuts, garlic, Korean red pepper powder, and ground black pepper in a bowl; add cucumbers and toss. Cover bowl with plastic wrap and refrigerate until flavors blend, at least 30 minutes.
The nutrition data for this recipe includes the full amount of sodium from the salt. The actual amount of the salt consumed will vary.
Red pepper flakes can be substituted for the Korean red pepper powder.
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