In the fourth season, Noah, Helen, Alison and Cole are away from each other and living in their own circles. Their fates were so intertwined, but now they are becoming more and more distant. Each character has a new love, but they all face difficult choices: Are they ready to completely forget the past? Between a new beginning and a tragic ending, is there still a possibility of redemption and forgiveness? Sanaa Lathan plays Jenelle, the principal of the special effects school where Noah works this season. She is very cold. The school's management and faculty are dissatisfied with her and everything is against her. Ramon Rodriguez plays Ben, a Marine veteran who currently works for the Veterans Health Administration. He has a certain degree of post-traumatic stress disorder, and Alison, who works as a grief therapist, soon intersects with him. Russell Hornsby, Christopher Meyer, Amy Irving and Phoebe Tonkin guest star in the fourth season.