Proong Nee Gor Ruk Ter (2009)

Original title: พรุ่งนี้ก็รักเธอ

Por and Kaew are lovers who are about to get married. Then, tragedy strikes. Por’s older sister, Putt, murders Kaew’s older sister, King, because she believes her sister and her husband are having an affair. Naturally, after the killing, Kaew forces herself to break up with Por. There is a time jump of six years. During those six years, Kaew stayed in Rayong with her mother and brother, Kong, in their father's beach house. Por has become a successful businessman and moves to Hong Kong to manage a company branch there.