Ethan Hawke, Julie Delpy on 'Before Midnight'

Stars open up about their on-screen chemistry and off-screen heartache.
3:00 | 05/17/13

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Transcript for Ethan Hawke, Julie Delpy on 'Before Midnight'
It's rare to find a celebrity who will volunteer to talk about the work they did before the big budget blockbusters turn them from. Acting class mainstays to magazine cover obsessions. But in the case and Ethan Hawke and Julie -- be one of the first films of their storied careers. -- -- entrenched in -- hyper real love affair that has lasted decades long and still going strong. As ABC's juju Chang found out when she sat down with the stars. -- before midnight. I want to keep talking to -- Imagine growing older which the ever so hip and handsome Ethan -- and the -- -- Julie Dell. Ardent fans have watched them fall in love in Vienna in their twenty's before sunrise -- -- here's the deal this is what we should be she gets a train with me here in -- comes and kept them. Reunite in Paris with passion tinged with regret in their thirties before sunset. -- -- he stood together to dissolve into molecules. And now not quite middle aged we've witnessed them wrestle with the cold realities of happily ever after -- before midnight. What about me would you like to change. But in all three of these movies life gets in the way of love what it's not just in these three movies I'm sorry -- -- -- team need to speak. The movies have become underground classics attracting legions of fans in part because they feel so much like. Like real money. It feels so real. We try to end. Get took place was Celine and you see in those three films you know trying to find the right. He didn't you know the right balance. -- you know something that ring true but at the same -- it's totally fictional. The trilogy follows the star crossed lovers as they stroll through various idyllic European backtrack and sometimes and I feel like yeah. Everything helium and breathing oxygen. Some takes our twelve minutes -- making it feel like you're eavesdropping on a real conversation. Some of the hardest scene in the film -- I think this team that don't quite match like actually the walking talking. The films have -- -- a career project for the American and French stars they were first cast in before sunrise when they were both in their early twenties. Yeah where young yet neither one of -- -- a wrinkle in the world. But we watch it and I remember how insecure we felt being that age. Both are now in their forties as are their characters -- Jesse. And their lives on screen and off have -- it for a meeting for the first time today on the train did you find me attractive. Of course both Dell. -- While Hough went on to star blockbusters like Danica. Thanks to governments and was nominated for an Oscar in training day thanks for the help edge finish out. But -- -- personal life that sometimes brought the most attention. His marriage and headline churning divorce from -- Thurman and meant this remarriage to a woman who briefly worked as the family's nanny. All that material and emotional depth they bring to their on screen characters that I can't keep -- -- Part of that is showing the consequences of following your dreams in this case Jesse sending his son back to his ex wife in the states. After a summer custody visit. Think it would not towards -- -- increasingly integrated and it wants. -- -- -- It's an emotion -- knows all too well. One of the most painful moments of my life -- I mean every year every year after the summer because -- resume if you're dad you finally get some big -- time. In. Is -- into the summer approaches. This. Is like a rain clouds builds -- in its its lists like kicking off a scandal in Washington bleeding and every time. Don't be -- -- not only the stars of the film also co wrote it with director Richard league later how to use three right. These scripts how does that work. We -- Jennifer we days and days and weeks and weeks on end. And we've basically make fun of each other for about ten hours today. As a young director at -- -- was heralded as the voice of a generation that has hit. Dazed and confused since I love about these guys -- -- I get older they -- the same it. Now twenty years later he's matured just like Celine and -- You know 23 there were both able to get off the train and OK I'm not do anything for the next two weeks I guess I can but you know you get older you get. Responsibilities you might have a job you have people waiting on you you have dependence -- these these are bigger choices. Matter what age it's their chemistry that keeps viewers coming back from war. -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- about eighteen years ago we kinda. Sort of film it's not -- common. Khost or is -- in a movie together into -- three times and hopefully a fourth. For Nightline I'm juju Chang in New York.

This transcript has been automatically generated and may not be 100% accurate.

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