Yellowstone is set to return for the long-awaited second half of Season 5, and the stars are opening up about the unusual lengths the show went to in order to keep the ending secret until it airs. In a new behind-the-scenes featurette, the cast of Yellowstone share that while they had a lot of fun and laughter off-camera filming the upcoming episodes, the work was unusually intense this time around due to tightened security that was designed to protect the story. “This season has been very secretive,” Kelsey Asbille (Monica Dutton) acknowledges. “We get these redacted scripts,” Jen Landon (Tee…