The mysterious past and future...

"Okay! Today's training ends here! Now get in a line I want to tell something important to you all." (Jin)

After the tired students heard that the training was they were all cheering happily in their minds but dared not show it in front of Jin because just a few days ago Jin punched a guy and made him kiss the floor until cracks appeared in it, just because he was cheering, while standing too close to Jin. 

That guy still has trauma from that punch.

Slowly all of them stood in lines and the lines were made very neatly not even any uneven gaps were left, this scene could be mistaken for a military doing a death march on the battlefield. That's just how organized these students have become now. 

.

(Caution- detail bomb ahead)