Gei a ma de qing shu

Xiaowei travels to Thailand to find his "billionaire grandfather" who is out of contact due to debt problems, but unexpectedly finds the one who has been corresponding with his grandmother for years is not her husband. Zheng Xiaowei (Zheng Runqi) is convinced that his grandfather was a very wealthy man who made a considerable fortune in Thailand, and so armed with what he hopes is an address he has surreptitiously gleaned from one of grandmother's old letters, he sets off to introduce himself and hopefully get an early inheritance to pay off his not insubstantial debts. What he finds upon arrival, though, isn't quite what he expected.