yoo youngjae was one of the people in their 20s who suffered from alzheimer.

it started when he was eighteen. during his last year of high school, he started to suffer its symptoms such as misplacing things, forgetting where he put his belongings, and difficulty in concentrating. it didn't sound like a big deal, but as a student in his last year, they were much of a bother.

his mother was one of the people who suffered from alzheimer, too. youngjae was ten when his father decided to leave; he demanded a divorce, then remarried another woman. his mother wasn't in a good state when that happened, too; the disease that had reached its peak of destructing her, along with the departure of her husband pushed her to end her life without thinking about her son.

and so, youngjae carried on his life with the financial support of moon jongup's- his cousin- family, and moral support of jung daehyun- his best friend, who still look after him like an older brother even until college.