Arum shed tears when Hojoon said that.
She remembered that Hojoon mentioned it in his book.
Why did she recall that paragraph in his book while she was shedding tears?
"Why are you sobbing again? You look like a habitual crier. Do you like this jewel that much?"
"Yes, I like it so much. I'm not going to be treated as a trash can anymore. Boohoo..."
Hojoon was embarrassed, though he didn't mean it.
"I'm sorry. Back then I didn't know about geomancy very well. I just had to do as instructed. I really didn't know that you were hurt so much."
At that moment Hojoon thought of the law of mass conservation.