Han Geu-ru is a 20-year-old with Asperger syndrome, as signified in the dialogue, who works as a trauma cleaner for Move to Heaven, over which he took following his father's death. He is highly intelligent and extremely logical, and has an incredible memory, which allows him to uncover untold stories about the deceased through the collection of their important personal belongings. Following his father's practise, Geu-ru places the deceased's most important belongings in a yellow box, which he always insists on handing over to the next of kin; if they cannot be readily found or are unwilling to receive the box, Geu-ru always tries to find a way to pass it on regardless, often to Sang-gu's consternation.
Geu-ru also has a minor obsession with fish and marine life, since his parents regularly brought him to a giant aquarium as a child, and he continues to do so as an adult. When he feels panicked, Geu-ru recites facts about fish in order to calm himself. Despite his condition, there are a lot of people surrounding him who understand his situation and try their best to help him and comfort him.
