In case you still don't know what's so bad about sasaengs here's jaejoong talking about Some of his experiences(and they're not even the worst he's mentioned)
*rough trans
the only thing I find so amusing is how everyone always said TVXQ wasn’t the most popular in Japan and how so many other groups paved the way to japan yet when it’s a scandal suddenly everyone’s talking about how only TVXQ is famous LMAO OK THANKS