JIGSAW: Rite of passage (BTS/Reader SAW style AU)

"Experience is a harsh teacher. First comes the test, second comes the lesson. If you are to save as I save, then you will see the person in front of you is but a student. So I ask you, Officer Y/l/n: Has the pupil learned his lesson? Has hebeen taught the error of his ways? If yes, the key to his freedom lies in the...