Actor Rhys Muldoon, who plays Mark on the show, believes that despite Channel 9 not making the announcement, it won't be coming back for a sixth season.
"They are doing that thing where they go 'we are not saying yes but we are not saying '; that means no" he told Sydney Confidential.
"We've done five seasons. We're not coming back; let's just say it."
Muldoon, 51, has been announced as one of the star's in the new SBS drama Dead Lucky.