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Credit for awesome summary Attack on Titan Season 4 Wikipedia.
Jean envisions a secure future and a happy life with his wife and child. He is brought out of his dream by Hange, who asks him and Mikasa to join the remaining Survey Corps and Marleyans to stop Eren's intended genocide. Though Jean initially pushes back on Hange's offer, he eventually agrees after being reminded of Marco.
At their camp in the forest, Magath clashes with the Survey Corps about which side started the conflict and prompts a heated debate over who are the real "devils". Annie confronts Mikasa over whether she would be able to kill Eren if she cannot convince him to stop the Rumbling. They are about to fight, but then agree to try asking Eren.
While the group eats Hange's stew, the flying boat comes up as an option to reach the Founding Titan, but Eren's destination is yet unknown. When Yelena insists she doesn't have a clue either, Magath and Pieck reveal that she is actually a Marleyan, having faked her background to join Zeke. Hearing this, Yelena counters by forcing Reiner, Annie, Armin and Jean to confront their own actions, including how Reiner caused Marco to be eaten by a Titan, thus preventing the exposure of the Warriors.
Furious at Reiner's over-exaggerated self-pity over Marco's death, Jean savagely attacks and beats him, but the others intervene. Gabi pleads for Jean's help to save her family in Marley, but he storms off.
The next morning, Jean returns and agrees to join their alliance. As they head towards the port in order to take the flying boat, he apologizes to Gabi but admits that he is still unable to forgive Reiner. Pieck goes forward to scout, and they discover that the Jaegerists have control of the port, and Floch has taken Kiyomi Azumabito hostage.