A 15-year-old circus ringmaster Wei-wei is left all alone with gorilla Ling-ling after grandfather passes away. Thanks to her grandfather's love for baseball, Ling-ling was trained to play baseball and has developed remarkable hitting skills.
| Actor | Role |
|---|---|
 Xu JiaoWei-wei | Wei-wei |
 Sung Dong-ilSung Chung-su | Sung Chung-su |
 Kim Kang-wooKim | Kim |
 Kim Jung-taeRival Baseball Team Director | Rival Baseball Team Director |
 Joe OdagiriIto Hiroshi | Ito Hiroshi |
 Kim Hie-wonLoan Shark | Loan Shark |
 Kim Eung-sooKBO Commissioner | KBO Commissioner |
 Byun Hee-bongWei-wei's Grandfather | Wei-wei's Grandfather |
 Kim Ji-youngYoung Wei-wei | Young Wei-wei |
 Ko Chang-seokDetective So | Detective So |
 Don LeeCaster | Caster |
 Kim Jung-eunJung-eun | Jung-eun |
 Kim Heung-raeMr. Go | Mr. Go |
 Jo Jae-yunOrthopedic Doctor | Orthopedic Doctor |
 Jung In-giGong In-gu | Gong In-gu |
 Jung Ji-yoonShow Host | Show Host |
 Kim In-chulReferee | Referee |
 Lee Jun-hyeokZeroz | Zeroz |
 Kim Jung-palDoosan Bears Manager | Doosan Bears Manager |
 Na Ju-hoMan with Fan | Man with Fan |
 Kim Hong-sooLin Xiaogang | Lin Xiaogang |
| HHan Young-gyunNC Bench Player | NC Bench Player |
 Cheon Yeong-amNC Bench Player | NC Bench Player |
| KKim Seong-raeDoosan Bears Coach | Doosan Bears Coach |