Lia does not know what it is but for some reason she believes that or almost takes James as someone who isn't fond of the concept of apologizing because it's on his face and it's quite hilarious for her to not.
Also a bit adorable but Lia is just not going to mention that in her head just so she doesn't think of him in any way other than as a teacher.
If there's anything, it's that he looks genuine at its best and she likes that he is trying at the very least.
He seems to be acknowledging his mistake and Lia likes that because she doesn't like people who try to dodge it around especially men because of some kind of a stupid alpha male image they have going on in their heads.
Lia hates that but she won't say it just yet and there's no need to either because he seems fine. Like a nice, present and very well presented man which Lia finds extremely good as she notices the way his entire stature is.