To escape an arranged marriage in the Dragon Palace, Kim Yong-man, the dragon king's daughter, flees to the human world and begins high school, determined to become the top of her class. There, she encounters Shim Hae-soo, the current number one student sitting beside her. As rivalry shifts into friendship, the two gradually become special to each other.
| Actor | Role |
|---|---|
 Yeo Min-jeongKim Yong-man (voice) | Kim Yong-man (voice) |
 Kim Min-juShim Hae-soo (voice) | Shim Hae-soo (voice) |
 Hwang Dong-hyunNa Moo-jin (voice) | Na Moo-jin (voice) |
 Hwang Chang-yungMin Moon-oh (voice) | Min Moon-oh (voice) |
 Jang Ye-naSong Jin-woo (voice) | Song Jin-woo (voice) |
 Choi Seung-hoonJoo Hong-seob (voice) | Joo Hong-seob (voice) |
 Jeon Hae-riNarrator (voice) | Narrator (voice) |
 Kim Ji-yulPE Teacher (voice) | PE Teacher (voice) |