As many of you Cassies know, it's Jaejoong's birthday in Korea today! To commemorate this special day, many of Jaejoong's fans attended a 'Hero Festival' party in his honor on January 23rd. Located in Seoul, the event gave fans the opportunity to mingle and share their love for this handsome star (who's now 26 years old). To his fans' delight, Jaejoong sent in a homemade video of himself exercising his chest muscles. Many entertained devilish thoughts, as they took the exercising of his "chest" muscles in the wrong way... The video then continued, as it showed an embarrassed Jaejoong telling the audience to not take what he's saying in the wrong way. Hilariously, he tries to dispel his embarrassment by doing a short exercise routine with his cat, JiJi. Check out the video (and happy 26th birthday to Jaejoong!) Thanks to jaesixstar for the tip!