Deep in the Jungle (2008)

Nawin, a secret agent, goes rogue to rescue a mysterious woman, Jin, from the private military force that abducted her. They flee to her birthplace, pursued by the force’s captain, and also by Jin’s brother, a killer capable of transforming into a giant serpent. Original title: ปาฏิหาริย์รักต่างพันธุ์ (2008)