So.

People are really wonderin why taemin didn't inform siwoon the truth. It's not just about pride. I mean he was butthurt, not literally but soon though, you can't just give in to someone who just left you behind without a reason why. Siwoon needs to explain his disappering act first lol. Just imagine your best bud just gone and you're left with a bitter idea that maybe you weren't 'that' important for him to inform his absence.