Four different couples have a romantic week over New Year's Eve. Both coming out of failed marriages, Ji-ho and Hyo-young are not open to the possibility of new love, while Jin-ah heads to the other side of globe and encounters Jae-hun.
| Actor | Role |
|---|---|
 Kim Kang-wooJi-ho | Ji-ho |
 Yoo In-naHyo-yeong | Hyo-yeong |
 Yoo Yeon-seokJae-heon | Jae-heon |
 Lee Yeon-heeJin-a | Jin-a |
 Lee Dong-hwiYong-chan | Yong-chan |
 Chen DulingYaolin | Yaolin |
 Yeom Hye-ranYong-mi | Yong-mi |
 Sooyoung ChoiO-wol | O-wol |
 Teo YooRae-hwan | Rae-hwan |
 Ye Su-jeongHye-shim | Hye-shim |
 Kim Kwang-kyuPolice Department Chief | Police Department Chief |
 Nam Bo-raNeighborhood | Neighborhood |
 Ra Mi-ranMarriage Doctor | Marriage Doctor |
 Lee Jun-hyeokCoach | Coach |
 Oh Sang-jinRadio DJ | Radio DJ |
 Cho Han-chulMr. Yoon | Mr. Yoon |
 Ahn Se-haPolice Baek | Police Baek |
| PPonchy BrusseJose | Jose |
 Song Sang-eunDetective Song | Detective Song |
 Lee Ji-haSki Resort Manager | Ski Resort Manager |
 Kim Ji-youngNamsan | Namsan |
 Son Jong-hakWholesaler | Wholesaler |
 Choi Si-wonEx-boyfriend | Ex-boyfriend |
 Seo Hyun-wooHyo-yeong's Husband | Hyo-yeong's Husband |
 Park Kang-seopReporter | Reporter |
 Kim Min-seoJi-ho's Daughter | Ji-ho's Daughter |
 Jeong Gyu-suReal Estate Agent | Real Estate Agent |