She and he were enemies, incompatible with each other.
She and he were trapped in the same situation and got to know each other because of killing each other.
Men and women with different agendas turn from enemies into allies on their way to get what they want.
"Why do you love me?"
"..."
Later.
She finally knew that he had been painstakingly accompanying her on this blood-stained road, and his silence was a shocking confession.
If so, you must have an answer.
Loving you is an instinct.
