Er gebeuren vreemde dingen in de gesloten toiletten van Eun-Hee's oude school, waar ze nu plaatsvervangend schoolhoofd is. Ha-Young en So-Yeon, die de plaats als hun schuilplaats gebruikten, geloven dat daar een geest zit nadat ze een zoemend geluid hoorden echoën in het toilet. Ha-Young gelooft dat het mysterie verband houdt met Eun-Hee, en nadat ze beschuldigd wordt, krijgt Eun-Hee onbekende fantasieën en hallucinaties.
Nee, helaas is 여고괴담 여섯번째 이야기: 모교 nog niet beschikbaar op Netflix in Nederland.
| Visual Effects | Hong Jang-pyo | Special Effects Supervisor |
| Costume & Make-Up | Kim Da-jung | Costume Design |
| Art | Shin Seon-hwa | Art Direction |
| Camera | Park Byung-deok | Still Photographer |
| Production | 이춘연 | Executive Producer |
| Sound | Kim Yong-gyun | Sound Supervisor |
| Lighting | Kim Gwang-min | Lighting Director |
| Costume & Make-Up | Choi Min-seon | Makeup & Hair |
| Art | Woo Je-hyung | Set Decoration |
| Crew | Oh Se-yeong | Martial Arts Choreographer |
| Crew | Lee Tae-ho | Stunts |
| Sound | Jung Jin-wook | Production Sound Mixer |
| Crew | No Hyeong-gi | Stunts |
| Sound | 김미미 | Boom Operator |
| Visual Effects | Kim Seong-hwan | VFX Supervisor |
| Writing | Lee Mi-young | Writer |
| Directing | Lee Mi-young | Director |
| Editing | Lee Yoon-hee | Editor |
| Camera | Sung Seung-taek | Director of Photography |
| Editing | 박곡지 | Editor |
| Art | Koh Jae-young | Art Direction |
| Sound | 조성우 | Original Music Composer |
| Art | Jeon Gyeong-ran | Production Design |
| Production | Park Eun-ha | Producer |
| Editing | 권윤경 | Colorist |
