Levi's group joins the Scout Regiment, but they bring with them a hidden agenda. The upcoming expedition beyond the walls seems like the perfect opportunity to carry out their plan.
It all depends on how you do it.
Searching for Titans, subduing them...
كلّ شيء يعتمد على طريقتك. سواء 
...أكان البحث عن العمالقة أو إخضاعها