I wonder why glasses mother looks sad.

And "big hamburger", gluttony's family?

gnosha said:

I wonder why glasses mother looks sad.

And "big hamburger", gluttony's family?

I think she knows what happened to Hook-bang's mom, and feels empathy for their family.

sneaky7 said:

I think she knows what happened to Hook-bang's mom, and feels empathy for their family.

that or she realized glutton nun is sad everyone else's parents are coming over

Taidgh said:

that or she realized glutton nun is sad everyone else's parents are coming over

Definitely the latter since Scowly is comforting Protag-nun who's probably none the wiser about her own circumstances.

Taidgh said:

that or she realized glutton nun is sad everyone else's parents are coming over

Now that you've mentioned it, seems like she is really looking towards Glutton rather than Hook-dad.