When loveable Labrador Maeumee has a set of puppies, Dong-Wook's grades start to suffer. Because of this, Dong-Wook's mother decides to get rid of Maeumee and the puppies. The dogs then stay at a relative's video shop until the animals can be placed into an animal training center. Meanwhile, two unscrupulous jewel thieves come into the video store and spots the little puppies. Hyeok-Pil decides to steal the littlest puppy to use as a runner to transport diamonds. Maeumee spots the two men taking away her young puppy and goes after the thieves! Can Maeumee save her puppy? Will Dong-Wook ever get to see Maeumee and the puppies again?
| Actor | Role |
|---|---|
 Song Joong-kiDong-wook | Dong-wook |
 Sung Dong-ilHyeok-Pil | Hyeok-Pil |
 Kim Jung-taeDu-Pil | Du-Pil |
 Hans ZhangZhao Ming | Zhao Ming |
 Kwon Hae-hyoBong-Goo | Bong-Goo |
 Park Soon-cheonMother | Mother |
| YYu Jin-aSeo-gyeong | Seo-gyeong |
 Min ChunxiaoMay | May |
 Jung Joo-yeonStudent | Student |
 Geum Dong-hyeonTeol-bo | Teol-bo |
 Lee Chang-hoonVeterinarian | Veterinarian |
 Yoon Se-hyunTroublemaker 3 | Troublemaker 3 |
 Lee Jeong-wooTroublemaker 2 | Troublemaker 2 |
 Jung Yoon-seoParent | Parent |
 Cho Jae-ryongPolice | Police |