Tosaporn Achawanuntakul (Sin) is well-known as the vocalist and songwriter of the popular duo Singular. In 2003, the guys broke their fans’ hearts when they decided to split up. After a long hiatus, the 29-year-old singer returns to the music scene with his first self-written solo single, “Goodbye.” The song pairs a breezy pop melody with Sin’s gentle singing, while a violin adds to the mellow mood.