Fire-type energy crystals had a tiny flame at the center, and Earth-type crystals had a brown clump of dirt.
On the other hand, Ra Jinho's super strength ability didn't have a specific crystal type. They could absorb energy from any crystal, though their absorption efficiency wasn't as high as it was for elemental-type ability users.
Aside from the differences in the crystal centers, the overall color of the crystals also varied in depth.
The lowest, most common level of energy crystal was almost entirely transparent, except for the small element at the center. As the crystal level increased, the color deepened, eventually turning nearly black.
Kim Haru recalled the twenty energy crystals he had collected from the zombies. Most of them, aside from the central element, were indeed clear.
Taking advantage of the fact that Shin Woncheon and the others couldn't see his farming system interface, Kim Haru opened it up and began carefully searching through it.
Sure enough, in the top left corner of the interface, next to the avatar representing him, Kim Haru saw this line: [Gold: 20].
Kim Haru recalled that he had never seen any rewards in the system related to gold, but after thinking for a moment, he quickly guessed that the "gold" mentioned by the system referred to the 20 energy crystals he already had.
He wasn't sure what this gold could be used for, but it was always good to accumulate more.
Kim Haru began to consider how he could gather more energy crystals.
Aside from killing zombies...
Since energy crystals had replaced currency in this post-apocalyptic world, it seemed he needed to find ways to make more money. However, being new here and not fully understanding the situation, he didn't know what he could offer as goods.
Would the vegetables he was growing be something people wanted?
Kim Haru frowned in thought.
In his moment of frustration, he almost forgot about the three people standing in front of him.
It was Shin Woncheon who couldn't resist the temptation of fresh vegetables and, after hesitating, raised his voice slightly to ask, "Do you need energy crystals, sir? If you don't mind, we could trade with you. You just need to give us a few vegetables—no, even just one vegetable, or even a single leaf would be enough! However many crystals you want, we'll find a way to get them for you!"
As he spoke, Shin Woncheon's face was full of nervous anticipation.
He knew all too well how precious normal vegetables were in this post-apocalyptic world. After all, even the big boss only had a tiny patch of sprouts here! To think he had the audacity to propose a trade with such a powerful figure—he felt shameless.
But Shin Woncheon simply couldn't suppress his desire.
These were uncontaminated vegetables! Eating them meant not having to worry about the virus inside them accumulating until one day it suddenly transformed them from a human into a mindless zombie.
In fact, according to experts and professors, consuming clean food over a long period might even help expel the virus that had built up inside their bodies, and potentially awaken new abilities.