Thorny Seong (Kor: 성가시) was a student in Reincarnation High. He falsely accused Mook for cheating in first year.
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| Characters | |
|---|---|
| Room 404 Residents | Aru Kim · Mari Kim · Sehui Seong · Sua Oh |
| Other Students | Beauty Kim · Chirpy · Chiyeol Jeong · Dante Ahn · Fairy Kim · Gang Ho · Jun Seo · Medusa · Mook Lee · So-om Keum · Sehui Seong · Stretch Nam · Squirt Noh · Thorny Seong · Waxy · Yeohee Woo |
| Faculty | History Teacher · Queen Yemma · Jayul Oh · Music Teacher · Owl · San |
| Alive Characters | Ajun Kim · Aru's Mother · Gang Ho's Father · Hwanhee's Grandmother · Hwanhee's Sister · Mook's Mother · Seonu |
| Others | Hwanhee Ki · Cloudy |