Wait I’m confused why did he say sorry in the last chapter?

He apologized because they can't go to their planned vacation since he got sick.

Ohh I meant the ML in chapter 55

Oh, probably because MC says " he only wants to forget heeseon"which they're having a deep conversation with their feelings and i think ML felt sorry for having MC thinks that he only does all these things to MC cause he wants to forget heeseon despite him having genuine feelings for our chef.