The Dublin star, who plays brain-damaged gang member Tommy, has hit back at speculation that the programme will end after the next season.
Clearly relishing the role, Killian (28) has hit back at reports that the end is in sight for the show and said that nothing has been set in stone yet.
"I don't know where people get this information, but it's news to me. I think the focus at the moment is season five, and if there is a season six and what that will be, that is a question for a later date," he said.
The award-winning show is currently filming season five, which will air as one of the highlights of RTE's autumn schedule.
The cast have been spotted in various locations around Dublin including Ballymun, Raheny and the IFSC as they try to make the series look as realistic as possible.
Meanwhile, Killian is continuing to blaze a trail when it comes to his big-screen projects, with a string of movies lined up for release.
Actor Killian Scott
"I've 71, which is coming out later in the year, which just got picked up for US distribution," he said.
"It's got Jack O'Connell in the lead role, a wonderful, young English actor. He's going to be a massive star, and rightfully so.
"Then I did my first lead role in a film called Traders which was myself and a guy called John Bradley West, who Game of Thrones fans will know as Sam.
"That's a really dark, really strong piece of writing from Peter Murphy and Rachel Moriarty, two Irish directors and writers."
Killian also joined forces with Love/Hate co-star Peter Coonan last summer in a movie which has the working title Get Up and Go.