Costanzo cast Keery and Emmy nominee as imagined, glamorous Hollywood legends of the period who enter the orbit of our doomed heroine, Mimosa (newcomer ), a sheltered young Italian woman primed for a small, safe, ordinary life—only for fate to intervene.

Source: https://www.vanityfair.com/hollywood/2023/09/awards-insider-finally-dawn-telluride-feature

Jonathan and Nancy have a history dating back to season 1. Nancy (Natalia Dyer) ends up befriending Jonathan (Charlie Heaton), who's being bullied by Steve (Joe Keery) and his fellow popular cronies.

Source: https://screenrant.com/stranger-things-season-5-romances-characters-will-mike-eleven-steve/

The teaser also hints at a link between a character named Gator, played by Joe Keery, and a potential dead body, suggesting heartbreaks and surprises in the storyline.

Source: https://collider.com/fargo-season-5-teaser-joe-keery-juno-temple/