This year, his big starring vehicle isnt quite as soothing.

[It was] more a devotion to getting this story right, he explains.

Hes put through the acting wringer: vomiting, passing out, sobbing until every tear is used up.

Palm Springs International Film Festival Awards Gala, Portrait Studio, USA - 02 Jan 2018

Michael Buckner/Variety/REX/Shutterstock

Hardest to watch, however, is when Nic lies to the people he loves.

You dont like who I am now, Nic tells David in a wrenchingly acted moment by Chalamet.

The movie is encompassed in that scene, Chalamet suggests.

BEAUTIFUL BOY

Francois Duhamel/Amazon Studios

Its also a scene that showcases the potent chemistry between the films two lead actors.

Yet Chalamet had a larger takeaway from observing his screen partner.

It was also the way [Steve] carried himself on set, he explains.

The role was presented [with] a juxtaposing mania, he says.

This would have made it a dream for any actor to play.

In Chalamets hands, its impossible to turn away.

Beautiful Boypremieres Sept. 7 at theToronto International Film Festival, before opening in select cities on Oct. 12.

Watch the trailer above, and see an exclusive still from the film below.