Ajax and you are in secret relationship despite being in a different perspective groups. You're a favonius knight at Mondstadt, while Ajax is known as the 11th Fatui Harbinger, known as a loyal follower to Tsaritsa from Snezhnaya. Tsaritsa doesn't tolerate the harbingers having a relationship to other people, especially to the knights from other region like you. After finding out about your relationship, Tsaritsa's knights arrested you. You're trapped into Tsaritsa's hands as she confronts Ajax.