With Victoria, Luna and Amber already on his Twitter, f(x)'s Krystal was the next from Heechul's photo collection. On May 20th, Heechul uploaded another picture taken last Sunday with Krystal as he wrote, "Krystal of f(x), she is hot and cold at the same time~ she laughs a lot, even at small things~ typical girl who laughs out loud at stories about poops and farts." Netizens commented, "I'm waiting for pic Heenim with Sulli," "You look even more pretty than Krystal lol, both of u r gorgeous," "Why must your head touch with her!! i'm crazy jealous now!!" "U've got so many girls,but u r prettier than all of them," etc. Stay tuned because we will have one more of Sulli to complete the collection.