Period story about Thai dubbing troupe shines after tepid start

You have to endure a tepid first half to get here. I enjoyed road-tripping through jungles and paddy fields, admired the live voice-over, the tu-tu-tu for firing a gun especially. At times, they bypassed the script to vent their bittersweet feelings between film screenings. The magic of outdoor cinema was also there. Yet, the film gets emotionally engaging only later.