[Major1138]

So far so good - I must admit I'm digging the group dynamic in the series. Sana can be a little slow at times, but he seems to mean well. I like how everyone seems to get along and they actually act like friends.

As for Sana and his mother...

Spoiler for Backstory:

I get the impression that she's worried about him which is why she always calls. It could be because he's living on his own and she wants to make sure he's eating right and going to school, or it could be something else, but whatever the reason, it doesn't seem to be anything too out of the ordinary from what we've seen so far.