Struggling artist Min Hee-do is offered three billion won to bet his life to a game against a rich old man, Kang No-sik, who is dying from a terminal illness. The game is for each man to dial a random phone number and guess if the person who answers will be male or female. Hee-do loses the bet, and after a month long brain operation, he wakes up to find that they have swapped bodies.

Yeo-min is a matured and thoughtful 9 year old boy who lives in a small mountain village. Even at his young age, he has too many things to take care of. First, he has to protect his friends from the neighborhood bully Black Bird and keep peace in his neighborhood. Second, he must share his lunch with his best friend Ki-jong who lives alone with his sister. And, third, he has to sell ice cream bars...

Ah-jung is a married woman in her mid-30s and has a five year-old son. She ghostwrites other people's biographies and at the moment, she is writing the biography of "an insurance sales queen." When Ah-jung's husband goes away on a business trip, she has no choice but to let her mother stay in their apartment. Ah-jung has problems dealing with her mother, a meddlesome woman who throws constant fits...

A man spends all of his tuition money on his sick father and is forced to take a job in a factory where he becomes involved with the plight of the foreign workers.

Yeo-min is a matured and thoughtful 9 year old boy who lives in a small mountain village. Even at his young age, he has too many things to take care of. First, he has to protect his friends from the neighborhood bully Black Bird and keep peace in his neighborhood. Second, he must share his lunch with his best friend Ki-jong who lives alone with his sister. And, third, he has to sell ice cream bars...

Struggling artist Min Hee-do is offered three billion won to bet his life to a game against a rich old man, Kang No-sik, who is dying from a terminal illness. The game is for each man to dial a random phone number and guess if the person who answers will be male or female. Hee-do loses the bet, and after a month long brain operation, he wakes up to find that they have swapped bodies.