Changmin had always love Jaejoong but it was one sided. Changmin was scared to confess at Jaejoong because he knew that he will get reject that's why he write all of his feelings on his diary. Changmin died before he even tell his love at Jaejoong. Jaejoong felt regret when he read Changmin dary. Jaejoong felt guilty when he saw Changmin was died after show that beautiful and warmth smile at him. That was when Jaejoong realized his love for Changmin.