The odor of Kas beer in Qingzhou Brewery in South Korea is due to the use of unhealthy or low-activity yeast during low-temperature fermentation. This taste will be produced when the beer is bottled before the fermentation is completed. Founded in 1933, Toyo Mai Liquor Co., Ltd., the manufacturer of Cass beer, is still popular all over the world and has won the first brand that Korean consumers like.