Dong-goo, a despicable thug, has been living a hopeless and miserable life. One day, he accidentally got a passbook with a huge sum of up to one billion won. He went to Busan to try to get the PIN code of the bank account. When Dong Jiu meets an eight-year-old boy Fudge (Zhao Yuanbin) and the boy's mother Aishu (Hong Yalin) in Busan, their story begins.