In his user table; There's such a field that's called an email setting:
The value in it's like this:
Here's a second.
In the user table there's a rencent topic field, which is also:
Why have the fields that have such strange characters.
It's called wecenter.
Thanks to the answer, when storing a binary data, it can be serialized. But I'm trying to an array. I can save it in json, and it can be serialized.