Cengiz seemed to have it all.
A high-paying job in Germany's tech sector gave him money and prestige, but his life was spiralling out of control. A cocaine addiction had pushed him to the brink of suicide.
Desperate for escape after waking up one morning in a pool of his own blood, he found salvation half a world away at a Buddhist monastery in Thailand known for its drug rehabilitation programme.
Henry, a 37-year-old heroin addict from Britain, came to Wat Thamkrabok after trying several traditional rehab clinics.
"For many of us here, this is our last chance," he said.