The whistling part was like a punch to my gut. They can't leave but the message is loud and clear. They are separated but still connected. A plea and thanks mixed in the wind for their beloved teacher. It's rare for a manhwa to spend time on making prison life details realistic.
oh christ....it took me fifteen minutes finish this chapter after the women started whistling and Ebony answered...not many things make me a wreck....but this was beautifully tragic...yet not without hope