You only live once. Jeong-min lives everyday in gambling debt and sex. He finds out his rich twin brother is missing and plans to take his place but his plans get complicated when his brother's sister-in-law Sae-eun appears. Jeong-min and Sae-eun who loves him start living together. Will Jeong-min overcome Sae-eun's seduction and put his brother's wealth in his hands?
| Actor | Role |
|---|---|
 Yoon Se-naJoo Sae-eun (주새은) | Joo Sae-eun (주새은) |
 Ah RiChae-ran (채란) | Chae-ran (채란) |
 Min Do-yoonPark Jeong-min (박정민) | Park Jeong-min (박정민) |
 Sin Seong-hoonPresident Choi (최사장) | President Choi (최사장) |
| LLee Yoo-chanTeam leader Sin (신팀장) | Team leader Sin (신팀장) |
| JJang Ji-eun-IMin Seon-woo (민선우) | Min Seon-woo (민선우) |