Are the behaviors of the main characters in "Cranes" consistent with the plot? Explain.

The answer to this question is subjective, and you are welcome to go either way and defend your stance. Personally, I would to say that characters' behavior is consistent with the plot. More often than not, students of mine like this story. That generally occurs when both plot and character are meshed well and work hand in hand.
Songsam and Tokchae are childhood friends that have been forced on opposite sides of a conflict for one reason or another. There is some animosity present at first, but too many memories of good times thaw those feelings quickly, and Songsam and Tokchae are freely discussing why one of them left while the other stayed behind. Their shared experiences are simply much more meaningful to them than current government beliefs. Their friendship is more powerful than their politics; therefore, each other's health and wellness trumps job responsibilities. This is why Songsam lets Tokchae go. The plot concludes with one person freeing another, and that only works in a reader's mind if those two characters have a stronger friendship than their political worldviews.