Eun-soo, a librarian watches for book vandalism that currently happens in the library. One day, she catches Jun-oh tearing off certain page of books. Eun-soo accuses him of vandalism but soon discovers the complex story behind his actions. Jun-oh’s girlfriend suddenly leaves him with only a mysterious note. “Look up page 198”. Jun-oh’s girlfriend was a bibliophile and she checked out books regularly at the library. Jun-oh goes to the library and tears out page 198 from every book he comes in touch. As Eun-soo has just broken up, she gives him an advice saying that he has to let her go if she really meant it. However, looking at Jun-oh torn apart by his love, Eun-soo starts to help him decipher the messages on page 198 of all the books .
| Actor | Role |
|---|---|
 Lee Dong-wookKim Joon Oh | Kim Joon Oh |
 Lee Jae-yongChairman Song | Chairman Song |
 EugeneJo Eun-soo | Jo Eun-soo |
 Ki Joo-bongHong-soo | Hong-soo |
| PPark Hwi-sunlaw student | law student |
 Jo Ah-raSun-mi | Sun-mi |
 Yoo Da-inneighbourhood girl | neighbourhood girl |
 Jo Deok-hyeonMr. Kim (guard) | Mr. Kim (guard) |
 Koh Soo-heemiss Paeng | miss Paeng |
 Jung Eun-pyopharmacist | pharmacist |
 Lee Jong-gupsychiatrist | psychiatrist |
 Jo Hyun-wuoffice employee | office employee |
 Na HyunSleeveless | Sleeveless |
 Park Hwi-soonDorm Student | Dorm Student |
| CChoe Won-kyungMonk | Monk |
| KKim Hyeon-juMin-joo | Min-joo |