Beautiful Boxer, a film based on famed transsexual kickboxer Nong Toom, has been a huge success in its native Thailand and is now set to be released in the UK.
By Neil Smith
BBC News entertainment reporter
Beautiful Boxer tells a story so odd it has to be true.
Beautiful Boxer tells the story of Thai kickboxing star Nong Toom
Parinya Charoenphol (also Kiatbusaba) was born a poor nomad who spent much of his early life in a monastery.
Realising he had a flair for kickboxing, he became a master at Muay Thai, the most traditional and revered form of the ancient martial art.
Feared by his opponents for his swooping kicks and devastating elbow blows, he became one of Thailand's best-known boxers - and its most controversial.
For Charoenphol, or Nong Toom as he became known, was a transsexual who wore make-up in the ring and dreamed of saving enough money for a sex change operation.
"For me, Nong Toom is like a walking paradox," says Ekachai Uekrongtham, the Thai-born director of Beautiful Boxer.
"He set out to master something that is totally masculine in order to become totally feminine."
Nong Toom would eventually realise his dream, having gender reassignment surgery in 1999 at the age of 17.
Forbidden to return to the ring - Thai women are not allowed to kickbox professionally - she now lives as an actress and model in Bangkok.
"My initial reaction towards her was quite negative," says the director.
"Thais hold kickboxing in very high regard, and I felt she had tarnished its image.
"It was not until I met her that I realised I had been very prejudiced against her, without giving her a chance."
Nong Toom played a significant role in the scripting process, though there was never any chance she would play herself on screen.
Real-life kickboxer Asanee Suwan plays the lead role in the film
Nor, says Uekrongtham, did she have a veto over how she would be depicted. "I told her from the start the film would not put her on a pedestal.
"This is fiction, a biopic. I wanted to capture the essence of who she is, in a way that would contribute to the themes I was interested in exploring."
One of the hardest aspects of production was finding an actor who could convincingly portray the contrasting sides of Nong Toom's persona.
Indeed, the director admits the problem almost proved unassailable.
"I decided very early on I wanted to cast a real kickboxer," he says.
I think he was man enough to be a woman