Myeong-ho (Hwang Hae), a middle school teacher who had grown up in poverty, and Bu-nam (Yang Hun), the first son of the president of a trading company, attend the same university. A doctor suggests that Bu-nam, who is sick due to overeating, and Myeong-ho, who suffers from malnutrition, should switch life styles for two weeks. While living in each other's house, they fall in love with each other's younger sister and get married at a joint wedding ceremony.
| Actor | Role |
|---|---|
 Hwang HaeKim Myeong-ho | Kim Myeong-ho |
| HHak-Ja JiKim Jeong-ok | Kim Jeong-ok |
 Lee Bin-hwaLee Min-ja | Lee Min-ja |
 Yang HoonLee Bu-nam | Lee Bu-nam |
 Bok Hye-sukMyeong-ho's mother | Myeong-ho's mother |
 Ji Bang-yeolBu-nam's father | Bu-nam's father |
 Go Seon-aeBu-nam's mother | Bu-nam's mother |
 Seok-cheon YangFiancé of Min-ja | Fiancé of Min-ja |
 Kim Hee-kapJigekkun ajeossi (coolie) | Jigekkun ajeossi (coolie) |
| YYun-su GyeongNot listed | Not listed |
| JJin-hui KimNot listed | Not listed |
| SSuk-ja KimNurse | Nurse |
| KKim Min-jaNurse | Nurse |
| AAe-ja KimNurse | Nurse |
| OO-heon KimNot listed | Not listed |
| SSi-chun ParkDoctor (special appearance) | Doctor (special appearance) |