Hong Kong star hoping for a monster hit with return to kung fu genre

"I haven't shot period dramas for a long time. Actually, I like historical stories which allow you to get into a quite different world and give you more freedom when acting," says Koo, in a promotional release from the distributors.

He also reveals that he had agreed to take the lead role without even reading the script.

"It gripped me just from the title. I haven't shot a monster movie for a long time, and I thought it would be fun to play," he explains.