Because it is made in a honeycomb container. According to the query on Food World.com.

1. Bingsu cheese is a dairy product made from milk, cream, sugar and protein. It's made in a container with a honeycomb mold, so when it solidifies, it develops a honeycomb texture.

2. The honeycomb texture of ice cream also makes it easier to absorb other ingredients, such as fruits, nuts and chocolate, than other types of ice cream.