An elderly mother goes missing in Seoul after accidentally separating from her husband at a train station. Her grown up children and husband search desperately for her over, plastering the city with posters. As they search over the next few days, then weeks and months, they each reflect on their relationships with their mom, and begin to realise they really didn't know her. They took her for granted and now become filled with guilty remorse. The story is told from shifting perspectives in the second voice, and in one segment also in the first voice, and that was really confusing. The grown up children were not particularly likeable but their characters felt only sketchily filled in.. They forgot about Mom throughout their lives, so by the time she was forgotten into oblivion, they have only their guilt left to nurture.