What is your opinion about the idea of cashless society in which all money is digital? Are there any

Hello [이름] [이름]. Thanks for this. A cashless society definitely aims for convenience. However, I agree with you, there are pros and cons to consider. Despite the drawbacks, a lot of countries are actually shifting to a cashless society. 

- T. Beth

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These days, My wallet is nolonger nessessary to buy something. Because I usually use cell phone to pay for some items.

>>>>  These days, my wallet is no longer necessary when buying something because I usually use my cellphone to pay for some items.

After installing some kind of apps, I can be able to put various cards including credit card. 

>>>> CORRECT.     
I want to be neutral about this subject for the follow reasons.

>>>> CORRECT.    

That means there are two sides.

>>>>  CORRECT.   

First If i use smart phone, The record automatically storage all of transactions.

>>>> First, if I use a smart phone, the transactions are automatically recorded.      

So It make users to be conveninet and reasonable on managing their money.
>>>>  So, it is convenient and reasonable for users to use on managing their money.   

However, If the owners lost the device like cellphone and Some of hackers attacked the programs, The user couldn`t avoid damage like releasing private information.

>>>> However, if the owner lost the device like the cellphone, some hackers will hack the program and this could lead to leak of private information.    

To solve this problems, I.T experts are trying to intensify individual security by using user`s finger frinting, face and iris recognitions.

>>>> To solve this problems, I.T experts are trying to intensify individual security by using user`s finger printing, face and iris recognitions.