Leeteuk die of sickness.He have stomach cancer(I'm sorry I don't know the scientific name of this cancer but this cancer are dangerous too if patience in stage 4( the critical stage) maybe the patience wil be fatal)Taeyeon his girlfriend who really love Leeteuk .She can't accep it that his lovely boyfriend die.This title story are "LeeTeuk Diary Book" it's because after Leeteuk die Taeyeon will read his diary.In his diary has alot memory that they created together.So want a know what Leeteuk