The teaser begins with Alicia Vikander's character happily recalling her initial feelings for her handsome husband, Danish artist Einar Wegener (Redmayne), got together.
"I was sure. He was so shy... And mysterious," she gushes to their friends.
Then, the mystery is unveiled.
"That fact is... I believe that I am a woman," Redmayne's character says in the emotional teaser for the film, which is based on the true story of the successful artist. He then seeks to undergo a sex change.
"It's my only hope. This is not my body. I have to let it go."