Wash the cucumber thoroughly and slice it into 0.5cm thick pieces.
Sprinkle salt over the cucumber slices and let them sit for 30 minutes.
Rinse the salted cucumbers in cold water, then squeeze out excess water.
Mix vinegar, sugar, and salt to make the seasoning sauce.
Add the seasoning sauce to the cucumbers and mix well.
Let it marinate in the refrigerator for at least 30 minutes before serving.