What does the number 1 next to the text mean in Kakaotalk?

So I know it's about whether the other person read it or not, but

Why is it marked with the number 1?

3518 2017-03-27 Gentleman

Meaning whether you read it as you know it.
The reason is that one person didn't watch it.
When we send a group message, it changes to two or three expressions.

Gentleman 8 years ago 0

A. 2

If you send a group message, there are cases where many people don't read it, so the number changes according to the number of people who didn't read it.

Gentleman 8 years ago 0

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