f(x)'s Krystal's making quite a few apologies this week - after apologizing to the whole netizen body past this week for her rude attitude she's shown on air, the girl made yet another apology to SNSD's member YoonA, for taking her lead role for the music drama, Melody. Krystal had been recently cast for a role of a girl named Yoona, which YoonA of SNSD (the matching name is entirely coincidental) has originally been penciled in for. However, due to inevitable scheduling conflicts, YoonA had to bow out. The production team believed Krystal was an ideal replacement, with her unique style and feel. Many netizens also agreed, as they believed that Krystal shares many identical features with YoonA, both personality and appearance-wise. After learning that she's actually taken YoonA's role, Krystal felt apologetic and expressed her feelings publicly for her senior. Music drama Melody has been written, produced, and directed by Oh Joon Sung, who is famous for being in charge of many successful dramas in the past like Boys Before Flowers, Prosecutor Princess, and Witch Yoohee. He praised Krystal's performance by commenting, "Despite her young age, she's professionally expressed the complex emotions the character has in the story."