Normal four years, the graduation age of female students is similar to that of domestic universities.
Boys usually go to the army for two years, so they will be late.
In addition, Korean college students especially like to drop out of school ... and drop out of school for a year or study abroad for a year.
Therefore, many students with student numbers of 2002 and 2003 have not graduated, and it is normal to count 6 7 years of university, so it will probably be 26/27 when they graduate.