Dirt

In the past, Ren Ye was quite skilled with halberds and daggers; having honed them during his time training in his youth. Between the both of them, Ren Ye has always used his daggers a lot more often than his halberds.

That being said, it didn't mean he didn't like using his halberd. 

It could be said he preferred his halberds much more than his daggers although daggers were much more versatile in battles.

The halberd, in his world, was wielded by royalty and nobility whereas the low men and guards wielded swords and daggers. The halberd was the symbol of war and dominance in his past.

A halberd cost as much as one's entire life saving as it had to be forged from the finest of metal. Ren Ye was fortunate enough to be given one after having saved a blacksmith's daughter from falling into the abuse of multiple men.

Ren Ye was also quite curious as to what weapon Old Yi has wielded before, "Old Yi, what weapon did you wield before?"