Sun Rithy's father and grandfather were both performers of the Lakhon Khol masked dance, but the ultra-Maoist Khmer Rouge - who scorned most art as decadent - banned its study when he was a child in the 1970s.
'Matter of survival for the tradition'
Now 48, Sun Rithy leads one of the last Lakhon Khol troupes in Cambodia, made up of about 20 performers and students aged six to 15. For him, teaching a new generation is a matter of survival for the tradition.
"I don't want Lakhon Khol ... to go extinct," Sun Rithy told Reuters.
Intangible cultural heritage
Lakhon Khol was recently listed by UNESCO, the United Nations' cultural agency, as an intangible cultural heritage, along with neighbouring Thailand's version of the dance, known as Khon.
There are different variations in Southeast Asia, all featuring dancers wearing elaborate painted masks depicting the Ramayana, a Sanskrit epic poem in which a prince rescues his wife from a demon with help from an army of monkeys.
Rise from destruction
But in Cambodia, the art form is still struggling to recover from the Khmer Rouge, under whose genocidal 1975-79 rule at least 1.7 million people, including artists, dancers and writers, died, mostly from starvation, overwork, disease, execution or torture.
"In the Khmer Rouge, I was young and they didn't teach people dance. Lakhon Khol was destroyed," said Sun Rithy, who started to learn the dance when he was 14, after the Khmer Rouge were ousted from power.
Rehearsal for revival
Ahead of a recent rehearsal, students stretched their legs and hands at the troupe's a newly built theatre at Wat Svay Andet, a Buddhist temple outside the capital, Phnom Penh.
Pum Pork, 49, said his 11-year-old son, Pum Meta, was attending the dance class.
"I want to have my son trained to perform so that in the future we won't lose the ancient art," he said.
Thailand's Khon tradition
Thailand's version of the dance has fared better than its neighbour's, but practitioners still depend on recruiting a new generation of performers.
Thailand's Khon tradition, originally centred on the royal court, is now taught by many schools and universities.
Hardwork of months
Mom Luang Pongsawad Sukhasvasti, 67, has followed his father's footstep in making Khon masks since he was 10 and still hand-fashions the masks from his home studio in Ayutthaya province, north of Bangkok.
Each mask takes a month to produce, from moulding the plaster to drawing the intricate details.
Pongsawad said the UNESCO listing could boost awareness.
"Teachers now must do more than teaching the dance," he said. "They need to help students understand the roots as well to preserve it."