I do know that it's entirely possible that Chan is grumpy about something entirely unrelated. When one is already grumpy, the slightest little thing can be irritating even when you'd otherwise find it cute or funny or charming.
It does seem that Chan is not happy about what's going on with Felix and Seungmin.
It does also seem that Seungmin is aware that Chan's not happy, and is doing his best to put on a professional fun silly idol performance, while also occasionally darting a worried and/or apprehensive glance at Chan.
But I'm not seriously suggesting that this supports any particular theory of Who's Banging Whom, and Who's Jealous About What.
It's more likely that Bang Chan is tired, or stressed about something else, and it's seeping out a bit.
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