Cafe Knock Knock is a cafe near the breakwater in front of Ilgwang Beach in Busan, serving coffee, traditional tea, and patbingsu. The nunkkot patbingsu is eaten by first having the snowflake ice, then pouring in the red bean that comes separately and mixing it. After ordering on the first floor, you can look out at Ilgwang Beach and the sea from the second floor. Succulents and small ornaments are placed throughout the interior, and crackers are given as a service.