Me, I liked both of them but my preference would always be the Taiwanese version ^.^ I found the emotional, heartbreak, declaration and romance scenes more realistic and intense then Korean's one ! And of course, there is my Joseph Cheng playing the lead role with the cute Ariel Lin, their chemistry, they both seemed so in their characters ! But I didn't dislike Kim Hyun Joong at all ! Infact, what I loved in playful kiss was that Baek Sung Jo is revealing more his feelings to Oh Ha Ni then Zhi Shu to Xiang Qin when Xiang Qin is much more insistent, determined and passionate then Oh Ha Ni (my POV ^^')! The fact that Zhi Shu made her lose all means when she was supposed to be tenacious and very optimistic about her love for him, then when she didn't get any reciprocation after craving for him during 5 long years, she was about to abandon, Zhi Shu caught her back on time I think the comfort level between Joe and Ariel is higher then Jong Su and Kim Hyun Joong ! Otherwise both were good !