It serves boarding and day-school pupils from the ages of 13 to 18.
It also found evidence, however, of great schools in challenging areas - 85 schools serving pupils from the most deprived families were judged outstanding.
In most cases, seowon served only pupils of the aristocratic yangban class.
Admission to the school, which serves pupils from the five boroughs, is by lottery.
It served pupils aged 13 to 18 who usually joined the school from one of the local intermediate schools.
Old Park School serves pupils from the age of 3 to 19.
This year, 85 schools serving pupils from the most deprived families were judged outstanding.
And film is such an important medium in society that it would serve younger pupils to study it.
Cantril High School was also opened to serve pupils aged 11-16.
Plympton has two state secondary schools serving pupils from ages 11-18.