Season 1 of The Rainbow Moon premiered on June 3, 2009.

Oradee, a masseuse, delivered a baby and then abandoned him to run off overseas to seek a better life. Arak, a 35-year-old transgender (katoey), adopted a boy named Tawan as his own son and also decided to leave his cabaret show career and his nature of being a homosexual behind, then opened a barber shop in Chiangmai .

When Tawan grew up, he went to university in Bangkok. Kayul, Tawan's close friend had a crush on him, but he fell in love with Plaifah, a popular university star and only daughter to major general, but she didn't pay attention to him. Tawan was secretly sending her text messages and sent her flowers everyday for 4 years at the university, but she didn't even know he was doing that or who her secret admirer was.