autnor corrects the brother's age to 27 on a twitter post here
https://x.com/MunKkwa/status/2077740947467899220
The author recently clarified on twitter (@munkkwa) that the brother is 26/27 like Ideum and the age written in ch 10 is a mistake and will be fixed in the future
Oooooooooooo I love when people cook, this thought didnt even cross my mind.
oh lmao. Ok i revise my take: he's VERY DEFINITELY the guy MC has a crush one. Being only one year older and redoing only one year due to missing classes is much more reasonable.
It's very likely that the ML's bro was the guy MC had a crush on given the physical similarities and the potential angst BUT there is one other factor: he's 29 and the MC is 26.
That's a three year gap. They did mention that the bro was sickly so he might've been held back due to missing too many classes.