1. Cash: In our daily lives, paper is typically cash. Cash can be replaced by Internet banking, but there should still be paper cash.

2. Note: Paper notes, too, must be there. Because if you don't have a paper note, the records from the past are gone.

3. A4 paper: It's very important. Because without A4 paper, we wouldn't be able to use a lot of this.

4. In fact, important documents in the company or government offices must be printed in paper form to produce and manage various editions such as original, original, e-bon, and copy. In the case of national institutions, digital data is also based on various backup systems. In the past, in the case of Nonghyup's computer network attack in Korea, all credit card payment ledger were digitally kept, and some of the credit card payment ledger data, which was the only one left and managed, was lost. So, it was one of the events that I felt I needed paper.