And for Langford, the final two episodes presented her with her greatest challenges.

And also the acts that happen are increasingly harsh, Langford tells EW.

I wanted this story to be truthful, Langford continues.

Katherine Langford as Hannah Baker

Credit: Beth Dubber/Netflix

12 was difficult because I put a lot of research into it.

Its so sickening and its uncomfortable and its ugly, but thats also why we needed to show it.

As for Hannahs suicide, Langford says the acting wasnt as difficult as the goodbye.

13 Reasons Whyis available on Netflix now.