A train ride brings two unlikely souls together as Bae, a committed partner of a serious 10-year relationship, sees her world turned upside down by the charming playboy Kim. Seated together on a business trip from Seoul to Busan, the two find themselves on an adventure to remember.
| Actor | Role |
|---|---|
 Moon Chae-wonBae Soo-jung | Bae Soo-jung |
 Yoo Yeon-seokKim Jae-hyun | Kim Jae-hyun |
 Jo Jae-yunSenior Gang | Senior Gang |
 Kim Seul-giDriver Hong | Driver Hong |
 Park Min-wooKang Jin-chul | Kang Jin-chul |
 Lee Yeon-dooBo-kyung | Bo-kyung |
 Kim Dae-ryungCoach | Coach |
 Lee Ju-wooInfo Lady | Info Lady |
 Lee Jung-eunRainbow Restaurant Employee | Rainbow Restaurant Employee |
 In Gyo-jinDong-wook | Dong-wook |
 Park Soo-youngSong-yi | Song-yi |
 Lee Eon-jeongByeong-hee | Byeong-hee |
 Lee Hae-youngRepresentative | Representative |
 Ga Deuk-hiYoon-joo | Yoon-joo |
 Moon Se-yoonCar center | Car center |
 Kim Jae-chulDepartment Store Product Evaluator | Department Store Product Evaluator |
| KKim Ho-yeonJin-chul's sister | Jin-chul's sister |
 Nam Se-rinMale Agency Employee 1 | Male Agency Employee 1 |
| LLee Seo-yulMale Miguhara Employee 1 | Male Miguhara Employee 1 |