An assistant to a TV producer, eager to stay off his bad side, promises to convince her former professor, a famous but reclusive academic, to appear on their show, which helps locate long-lost persons. Who does grey-haired Professor Yun Suk-young want to see again more than anything? The answer to that question lies decades in the past.
| Actor | Role |
|---|---|
 Lee Byung-hunYun Suk-young | Yun Suk-young |
 Soo AeSeo Jung-in | Seo Jung-in |
 Lee Se-eunLee Su-jin | Lee Su-jin |
 Lee Hae-eunBok-ja | Bok-ja |
 Choi Deok-moonSuk-young's Senior | Suk-young's Senior |
 Jeong Seok-yongMr. Kim | Mr. Kim |
| NNa Ki-sooSuk-young's Father | Suk-young's Father |
 Oh Dal-suNam Gyun-soo | Nam Gyun-soo |
 Yoo Hai-jinPD Kim | PD Kim |
 Kim Joong-kiSenior | Senior |
| PPark Nam-heeBranch School Principal | Branch School Principal |
 Park Chae-ikLiterary Society Member | Literary Society Member |
 Kim Do-kyoonLiterary Society Member | Literary Society Member |
 Son In-yongLiterary Society Member | Literary Society Member |
| KKim Jeong-haOld Woman | Old Woman |
 Kim Kyeong-ranOld Woman | Old Woman |
| CChoi Ji-yeonOld Woman | Old Woman |
 Park Chan-gukDetective | Detective |
 Choi Eun-sukPlainclothes Detective | Plainclothes Detective |