Transcript for 'A Simple Favor' cast on the film's love triangle, what it was like behind the scenes
with more. Two of hoood's mos pular leang laes,aekd and Blake lively face off as frs in the dark comedy, "A simple favor." A twisted clash between a workingom and Atay at home There Tino take eh other down. They're so inplete awe of the other person. Thethriller,etn a picture pe subur nsion, complete with a da ding husband, played by Hollywood newcomer Henry going. Lurkingelow the surface T gleaming veneer, things are Nott theem. Five days ago, emilyt missing. The movie tapso oft ored LIV of women. There's this ideahat W all leadse picture perfect LIV but underneath, there's a mess. Theifferent versions of pretendhat you have the perfect life. I wen down the rabbi hole on YouTube and found a lot of mommy blogs there reallyreat and honest a then indome that wereery sunny, all whi backgroundnd there was something about it thawareally , like, picture perfecg, ethat you D that's daring or provocative or adventu is ally celebrate a then suddenly, your past, yourhis that were provocative O dangerous, they suddenly become concealed behind motherhood and family or pare Anna Rick IST known R her spot-on pors of tight, uncrtablearacters. To that. Thank Yo I'm assuming that's good acting because I can't imagine that you're awkwa in real life. This was -- thisushed the boundaries of how a human person be. Lively stars as the tlam glam rouse and mysterious Emily with a fashion jobnew York. Did just take myicture? Erase it. My character's a ychopath so I felt it was entirely different thannything I've ever known.ond by sharing secrets. I thinkheh really lonely and they're outsi their own way. E E sort of le-led thriller, whr it's "Gone rl" why do you think this isnewxp ecause women have secrets. I think, kn, sometimes woman's life is notsplored. Blake, whose own megawatt relationship with husband Ryan Reynolds is in the spotlig says it was liberatinglaying er sociopath? S more just like everything that you see I a veneer so I stopped tg to hi my sociopath. A motherself to dghters Jame and Inez, she bply dierent type of mom in the movie. Does your kid drink, maybe? It's Nev T early to startaching em. Hink you'r joking but great. Sailor in front of I D ask fhe children be removed, least. Did you reay?he so tiny WHE W were shoin with , I would very neutered version then I'd an youremove the kids so we ca impronow? Twhos Subaru is bin garage to get my to SP apologg. Maybe you can get her to start. Henry goldi just Ng off the smer smash hit crazy rans plays lively'sand. Here you aren thiig smash hit, crazy rich Asians and ts movie, you charr, it's not even med that you're Asian. Caught up in agenre-bending love triangle. She's anma, myife. It's what drew know her. It can als make heimpole. She can be so fiercely private Who theetter kisser? I'm going the Keep I classy, San diego.y neutral and say B girls are absely amazing. Female-driven thisiller, featurg two sophistic file leads, hopes to the same. Women have been so underserinovies for so long. They werust P nsional characters and itt drovey craz and I just got tired of watch stiebout men. And often men are celebrated foeiand all T adures where women, there's this idea sort of have to beompletely pur you T to know their history. Think the idea that there are these dark secrets is reallyexciting. "Tline," inew York. Next here, 1yearslater,
This transcript has been automatically generated and may not be 100% accurate.