Season 1 of Threesome premiered on August 29, 2021.

The young Swedish couple David and Siri who have been together since high school have the love that is self-evident and strong, until they meet French art student Camille on a rainy night out.

Season 2 of Threesome premiered on July 3, 2024.

David discovers Siri's infidelity with John and, after confronting her, moves in with his friend Mario. While adjusting to his new life, David meets Joanna and they develop a connection. David grapples with his feelings for Siri and Joanna, culminating in a conversation with Siri about whether he wants to start fresh with her or move on with Joanna.