JYJ's Junsu is not one to forget his promises to fans, and he proved so when he fulfilled his fans' wishes with a cover of a Buzz song and a dance tutorial to "OeO"! 

At his concert held on December 29, Junsu had proceeded a corner titled 'genie time' where he listened to three of his fans' wishes and attempted to fulfill those wishes on the spot. 

One of the three wishes happened to be from a male fan who complained that "the concert set list was focused too much on the female fans." So he stepped forward to speak for all the male fans who wanted Junsu to perform a Buzz song titled "You Don't Know Men." 

At the time, however, Junsu couldn't fulfill the male fans's wishes because he didn't know that particular song. So he promised, "I'm really sorry. I will practice and be sure to upload a video [of myself performing the song]." 

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True to his word, Junsu uploaded the video for all his loyal male fans! D'awww, Junsu looks a bit shy, doesn't he? The singer also teachers the steps to his song "OeO," which you can watch in the clip above!