Josh Radnor Flirts With Elizabeth Olsen in 'Liberal Arts' Trailer (Video)

The "How I Met Your Mother" star also wrote and directed the love story about a stunted thirtysomething who falls for a much-younger co-ed.

The trailer for Liberal Arts, co-starring Josh Radnor and Elizabeth Olsen, has hit the web -- sans an appearance from Zac Efron, who makes a cameo in the film.

Liberal Arts, which Radnor (also known as hopeless romantic Ted Mosby from the CBS sitcom How I Met Your Mother) also wrote and directed, tells the story of a listless 35-year-old who returns to his alma mater to speak at his professor’s retirement dinner and falls for a 19-year-old sophomore (Olsen) at the school.

Richard Jenkins, Allison Janney, John Magaro and Elizabeth Reaser also star. 

REVIEW: 'Liberal Arts'

IFC acquired the film following its crowd-pleasing premiere at the 2012 Sundance Film Festival; two years prior, Radnor's directorial debut, Happythankyoumoreplease, won the narrative feature audience award in Park City, Utah.

"He's just really passionate," Olsen said of Radnor in a recent interview with THR. "He's been developing this project for a while, and ... he knows what he wants and he's just such a good guy."

That said, she added, "I do have to say that Zac Efron and Allison Janney steal the film, I think, in my personal opinion."

Liberal Arts hits theaters on Sept. 14.