Dongwoo once saw a ghost of Myungsoo in their dorm. 

Myungsoo came into his (Dongwoo) to ask if he was going to eat the cheesecake that a fan had given them (there were 4slices left at the time). Dongwoo said he would, so Myungsoo left to go to the kitchen to get the cheesecake. But time some time passed, and Myungsoo, who left to get the cheesecake, still hadn’t come back, so Dongwoo, feeling frustrated left for the kitchen. But the moment he left for the kitchen he froze in his place. Because he realized that that day Myungsoo was in the middle of filming a drama in Japan, and wasn’t in Korea. But he is certain that he saw Myungsoo leaving to go to the kitchen. And there were only 2 slices of cheesecake left.