In American Sign Language, the word for endure is two fists connected with the tips of the thumbs touching and not breaking as you push out from your chest. In ASL, to endure is to be fragile but strong nonetheless.
During her audition monologue, Yoo-na uses Korean Sign Language to tell Uncle Vanya to endure — digging her fist and her thumb into her chest, above her heart. In KSL, to endure is to cut into your heart and keep going. 

I adore the space that was given to the characters. There was so much weight given to their words and it forced you to watch, listen, and understand — no matter if you agreed with them or not.