Burnt Sugar (2009)

Pawan or Pe was the only son of a real estate businessman. After his mother died, his father fell in love and had an affair with a married woman. Later, his father was shot by his lover's husband. So, Pawan had prejudice against married woman. However, he had a crush on Thuma or Bo, an interior designer in his company. When he knew that she was a married woman, he tried to stay away from her, but he couldn't resist her charming nature. Thuma got married with Tao, her brother's friend because her family had some financial problem and Tao volunteered to help her. But after she moved to America with him, she realized that Tao was gay and she had to live in the same house with her husband and his boyfriend. Later, she couldn't bear that situation anymore, so she came back to Thailand and got a job in Pawan's company.