Yeogo goedam

Yeogogoedam (여고괴담) or the Memento Mori Trilogy / Ghost School Trilogy is the name of several very loosely related K-Horror films, all having been set in all-girl schools, featuring ghosts, with no other links:

Yeogo goedam 1: Whispering Corridors
Yeogo goedam 2: Memento Mori (film)
Yeogo goedam 3: Wishing Stairs
Yeogo goedam 4: Voice (film)
Yeogo goedam 5: A Blood Pledge/Suicide Pact

Whispering Corridors series

Whispering Corridors (1998) • Memento Mori (1999) • Wishing Stairs (2003) • Voice (2005) • A Blood Pledge (2009)