The meaning of the number in the KakaoTalk chat window

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I don't know what the number 1 next to the text means in Kakaotalk.

I know it's about whether the other person read it or not, but why is it marked with the number 1?

Read not read It could be like this

365 3 8 years ago

pu1. There are cases where several people don't read it if you use a group chat, so the number changes as much as the person who didn't read it

2017-11-23

pu2. The meaning is 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 2 or 3

2017-11-23

pu3. Bboom, thank you for kindly

2017-11-23

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