Kang Soo is a loan shark, who just can't catch a break. After another hard day of nothing but disappointment, Kang Soo finds a poster asking if he wants to become happy. Sick of the life he's been living, he wants a change. In hopes of experiencing happiness for the first and possibly last time in his life, he goes to the research center on the poster.
아버지의 사채 빚을 떠안으며 매일을 견디듯이 살아내고 있는 사채 일수꾼, 강수. 엄마를 찾아 다시 행복한 가족을 만들고 싶다는 소박한 꿈도 현실에선 불가능해 보였다. 그러던 어느 날 강수는 우연히 ‘당신... 행복해지고 싶나요?’라고 적힌 전단지를 보게 되는데...
