Which South Korean horror film series is noted as helping to generate the explosion of the New Korean Wave cinematic movement containing movies like "Wishing Stairs"?
Wishing Stairs:  It is the third installment of the "Whispering Corridors" film series set in girls high schools, but, as with all films in the series, is unrelated to the others; apart from a song being sung in one scene that is a pivotal plot in "Voice". Whispering Corridors (film series):  The series is notable for helping generate the explosion of the New Korean Wave cinematic movement, and dealing with taboo topics such as authoritarianism in the harsh South Korean education system, gay relationships and teen suicide, following the liberalization of censorship.
Whispering Corridors