Hayes Costner made his acting debut with the western “Horizon: An American Saga- Chapter 1”.

His 15-year-old son Kevin Costner and Christine Baumgartner attended the film’s Los Angeles premiere and talked about working with his father, who co-wrote the screenplay with John S. Baird, stars, directs and produces.

“He “trapped” me. I got to spend all day with him, every day and watch him work,” Hayes said with a laugh, adding to ET: “I had a great time, it was an amazing experience. I am very proud of my father”.

It is noted that Costner’s ambitious four-part western series “Horizon: An American Saga”, is “a project in the great tradition of Warner Bros. westerns. which explores the Old West and how it was won – and lost – through the blood, sweat and tears of many. It takes place during the four years of the American Civil War (1861-1865) and takes the audience on an emotional journey of a country at war with itself.”

They are joined by a large cast including Sienna Miller, Sam Worthington, Danny Huston and Will Patton.

Responding to his son’s comment that he “trapped” him, the famous actor characteristically said: “I did it. I found a way to keep him close. He will not be so young again, he will not be so sweet and handsome again, he will grow up to be a young man. He’s very good in the movie.”

The project has been a lifelong gamble for nearly three decades for Costner, who even mortgaged his Santa Barbara home to help make it happen.

The first part hits theaters on June 28, the second on August 16, while the other two films are currently in development.