How many movies have Dimitur Nalbantov and Yana Stoyanova collaborated on?

They have worked on 3 movies together! Their first movie together was Boogeyman 3 (2008) while their highest rated movie together was The Grudge 3 (2009). They have not worked together since Messengers 2: The Scarecrow (2009). They are most known for their horror films together.