A love for a cousin, deeply engraved in childhood. Twelve years later, a stopped heart begins to beat again.
| Actor | Role |
|---|---|
 Jang In-subTaeik | Taeik |
 Bae So-eunAri | Ari |
 Cho Soo-hyangYeji | Yeji |
 Joo Ye-rinSeohui | Seohui |
| LLee Hyeong-guSuhyeon | Suhyeon |
 Kim Ja-youngAri ma | Ari ma |
| TTae-hyeong LimGrandpa | Grandpa |
| MMoon Tae-GeonYoung Taeik | Young Taeik |
 Oh Yu-jinYoung Ari | Young Ari |
| KKoo Ji-HyeYoung Yeji | Young Yeji |
| PPark Yeong-HunYoung Suhyeon | Young Suhyeon |
| LLim Ji-SuTaeik ma | Taeik ma |
| LLi Won-IkTaeik pa | Taeik pa |
 Song Yu-damUncle | Uncle |
 Park Se-junGidung | Gidung |
| CChang Jin-HoonYeji pa | Yeji pa |
| KKim Min-sookYeji ma | Yeji ma |
| NNam Tae-BuTaebu | Taebu |
| LLee Gwang-jinGidung Uncle | Gidung Uncle |
 Choi Dae-sungCafe manager | Cafe manager |
| KKim HannaCafe worker | Cafe worker |
| IIm Seong-GyuDaft Punk cosplayer 1 | Daft Punk cosplayer 1 |
| LLee Jae-JuDaft Punk cosplayer 2 | Daft Punk cosplayer 2 |
| MMoon Ji-hongParty guy voice | Party guy voice |
| JJung Se-naParty girl | Party girl |
 Lee Yu-miHye-jin | Hye-jin |
 Kim Han-na[Part-time cafe worker] | [Part-time cafe worker] |