Korean plum extract, also known as maesil cheong, is a sweet and tangy drink that is made from fermented plums. It is a popular traditional beverage in Seoul and is often enjoyed as a refreshing summer drink. Korean plum extract has a unique flavor that is both sweet and slightly sour. It can be enjoyed on its own or mixed with water or soda for a fruity and refreshing twist. Korean plum extract is also believed to have various health benefits, including aiding digestion and boosting the immune system.