After Victoria, Luna, Amber and Krystal, Heechul has finally completed his collection of f(x) girls with Sulli. On May 22nd, Heechul uploaded his selca with Sulli and wrote, "...Out of all the eye smiles I've seen, Sulli has the clear one that looks like it wouldn't try to trick me..." Netizens commented, "You really are twins," "beautiful girl + 1 beautiful "girl"," "long lost sibling???!!" "Why u didnt take any pic with hongki oppa??"etc