The Eastern territory has invaded and taken control of the Western territory. An anti-terrorist group was created a 年 before the invasion and it's now up to Frost (a.k.a Humphrey) and his squad to take down the Eastern 狼 and end the war.
Humphrey's flashback was the worst that he has ever seen in his life, being in Azerbaijan for the mission was really 给 him some problems, but he can fix it.