Xiao-xiao, who has ADHD, is the troublemaker in her class. But there's another complication: her mother, Wei-fang, and her homeroom, Paul, have started a romantic relationship after discussing her ADHD.
| Actor | Role |
|---|---|
 Audrey LinXiao-Xiao Zhou | Xiao-Xiao Zhou |
 Terrance Lau Chun-HimPual Chen | Pual Chen |
 Ivy ChenWei-Fang Zhuang | Wei-Fang Zhuang |
| CCheng Chih-weicaretaker | caretaker |
 Liu Kuan-TingTaxi driver | Taxi driver |
 Cheng Yu-chiehMr. Yang | Mr. Yang |
 Ina TsaiYushuai's mother | Yushuai's mother |
 Jacqueline ZhuQiongwen's mother | Qiongwen's mother |
 Shih Ming-shuaiZhou Qingzhen | Zhou Qingzhen |
 Sarso ChouP.E. teacher | P.E. teacher |
| CChen Mei-yuehShaofen's mother | Shaofen's mother |
 Alexei HuangMr. Luo | Mr. Luo |
| CCheng Yi-hsuanZhu Bocong | Zhu Bocong |
| LLi I-chengYongzhe | Yongzhe |
 Queenie ChenXinhua | Xinhua |
 Lee Meng-shaiFemale teacher | Female teacher |
| TTing-Chun ChangStudent's mother in the school gate | Student's mother in the school gate |
| WWang En-yongParent in the campground | Parent in the campground |
 Seyfert TangNeighbor in the lift | Neighbor in the lift |
| SShih Yi-jenSecretary | Secretary |
| JJoss HungPrincipal | Principal |
 Lin Shu-yuNurse in the hospital | Nurse in the hospital |