Episode 6 S01 E06

Yeo Jin-goo (as Jung Jae-min) Kim Seol-hyun (as Baek Ma-ri) Lee Jong-hyun (as Han Shi-hoo) Song Jong-ho (as Han Yoon-jae) Lee Il-hwa (as Kang Min-ha) Gil Eun-hye (as Jo Ah-ra) An Kil-kang (as Baek Seung-hoon) Yoon Ye-hee (as Song Sun-hwa) Kim Sun-kyung (as Won Sang-gu) Park Gun-tae (as Hwang Bum-sung) Jo Min-ki (as Jeong Byung-kwon) Kim Ji-ah (as Min-seon) Jung Hae-kyun (as Jo Jun-goo) Lim Seung-dae (as Shim Hyeong Jun) Yang Joo-ho (as Biology Teacher) Lim Seong-eon (as Homeroom Teacher) Kang Han-byul (as Young Han Shi-hoo) Han Seo-jin (as Young Baek Ma-ri) Ham Jin Sung (as Police Officer) Lee Won Hee (as Vampire)

vampire romance school alternate history based on webcomic or webtoon