SEOUL, South Korea — Just a few months ago, Park Geun-hye was the president of South Korea. Now she is Inmate No. 503.

The daughter of a president who spent her youth in the presidential residence, Ms. Park ascended to the presidency herself four years ago. She now lives in a 114-square-foot jail cell as she awaits her trial on corruption charges.

Ms. Park, whose privileged upbringing and fastidiousness earned her the nickname Princess, once had the city of Incheon install a new toilet for her use during a presidential visit, according to the city’s former mayor. Now she eats $1.30 meals (paid for by the government), washes her own tray and sleeps on a mattress on the floor.

She can watch the television in her cell for up to six and a half hours a day. Its only channel plays programs approved by the government, including news, documentaries and soap operas, the plots of which could hardly be as unlikely as Ms. Park’s tumble from power.