Share Read on Mobile Enter Reading Mode Seulong thanks IU for the surprise on his birthday Posted on 2017-05-13 01:01:59 by heej0130 IUsurprisedSeulongon his birthday.On May 10, Seulong thanked IU via Instagram with a photo and caption that said,"A cake for a birthday that I was just going to let it pass quietly. You, who made a surprise appearance with a cake, are really the best :) " Comment