I’m wondering why he’s in a chicken costume and if he’ll show his son he’s a guy i...

I think he knows that he’s not actually a chicken but I agree

So this is just my theory but

I think he’s wearing a chicken suit cuz he wants the kid to believe that underneath that chicken suit is his mom (the guy’s sister that left). Maybe the guy is scared that Jun will feel abandoned that his mom left, or that his ‘mom’ is actually a guy, so he keeps the suit on. So to keep the belief alive for Jun that his mom was always with him. That’s why the guy doesn’t say anything, and also always wears the suit around Jun, but not the dad.

Oh that makes sense