here are just a few the million ways Jongdae has supported Junmyeon over the years:

-said Junmyeon['s voice] is his favourite & wants to see him on King of Masked Singer
-attended the VIP premiere of Glory Day, Junmyeon's movie
-watched The Last Kiss, Junmyeon's first musical

-Jongdae went to the VIP premiere of Middle School Student A, Junmyeon's movie
-Jongdae watched The Man Who Laughs, Junmyeon's musical
-Jongdae constantly talks about how Junmyeon takes care of everyone else and how he wants to take care of Junmyeon in return

onstage or offstage, Jongdae is always one of the first people to check on Junmyeon

Jongdae is always fixing Junmyeon's mic, checking if he needs tissues/water, always helping out any way he can. His support is constant, he's always doing little things to help ease Junmyeon's burden

when Kim Gura spent an entire episode insulting Junmyeon (who wasn't even a guest on the show that day!), Jongdae jumped to his defense and shut that shit down

in big ways and small, visible and invisible, Jongdae has been a constant source of support and comfort for his Junmyeon-hyung. nothing anonymous cowards say on the internet will change that.