Considering its massive cast, the first season of 13 Reasons Why really centred primarily on one person: the earnest, troubled, magnetic Hannah Baker (Katharine Langford). Over the course of the season, we learned about Hannah's struggle with bullying, depression, and suicidal ideation through the lens of her classmates and teachers. 13 Reasons Why was essentially, the Hannah Baker show.
The second season takes place five months after Hannah Baker's death. The focus, now, is on the people Hannah left behind. How have their lives changed in the past months? How does the gut-wrenching trial, which exposes so many of their inner secrets, set them up for their futures? Going forward, these people will be the protagonists of 13 Reasons Why.