In the series, Kook Yeon Su was seen bringing Jujube (also known as Red Dates) Tea to Choi Ung (Choi Woo Shik) to help with his insomnia.

Red dates are used to create traditional medicine in Korea, and are also a well-known snack. It has high fiber, low calories, and are rich in vitamins A and C. Jujube helps in alleviating stress, treating the common cold, cough, and sore throat. Additionally, it helps one sleep better.
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