Being a celebrity must be really tough

Looking at it, someone posted something filled with all sorts of malice, claiming that because Kim Dong-ryul didn't say goodbye on his way out after the concert, he doesn't care about his fans. It's quite a sight to see.
I've been going to his concerts for four years, but I couldn't make it this year.
I never even thought about trying to catch him during his "way out" (exit greeting)..
I don't even understand why people try to watch that..