How many movies have Pen-Ek Ratanaruang and Sombatsara Teerasaroch collaborated on?

They have worked on 3 movies together! Their first movie together was 6ixtynin9 (1999) while their highest rated movie together was Last Life in the Universe (2003). They have not worked together since Last Life in the Universe (2003). They are most known for their comedy films together.