Well no. In previous chapter, he asked him to have fun for a moment and then go to Haesoo because he had gut feelings that his brother might do something but now he saw his guard is still here and didn't go to haesoo so I believe he's panicked because of that. That's why the guard is terrified as well. The guard wasted his time talking with that rich girl and forgot Taeha order.
Thank you. Tae-ha being panicked because he saw Jay makes more sense. I was confused as to why he would be panicked after seeing Jay since he called for Jay, but someone mentioned the mom was in on it. So she probably lied about Tae-ha calling for Jay and then that would explain all of the expressions and panic for Tae-ha.

Can someone explain this last chapter? How do Tae-ha and Jace both know what's going on? I kinda get the hunch that Tae-ha had, but not really. Like he was expecting more of an answer from Na-Haesu right? But because she didn't give more of one he's suspicious? That's fair I guess (if that's even right) but why did he suddenly pause and get the look of panic and how does Jace also know?
This is bothering me