The boy was sitting cross-legged, lost in meditation, and he was as cute as if he’d stepped out of a fairy tale. It was puzzling enough that a boy like that would be inside a cavern, but that wasn’t what surprised Yeon-woo the most. ‘Isn’t that a Snow Ginseng?' 

The boy wasn’t really a person. It was an elixir that took the shape of a human being. 

[Humanoid Snow Ginseng]
[Classification: Elixir or Mystical Creature]
[Rank: A+]
[Description: A ginseng that only grows on icy plains while being exposed to the energy of the moon for hundreds of years. Because of its shape, many people mistake it for a human. It will increase mana after consumption. However, the increase depends on the ability of the consumer. The method of ingestion is also very tricky.] 

Only a handful of such rare elixirs existed in the Tower. ‘I've only heard about it as one of the five best elixirs. I never expected this.’ Yeon-woo's eyes grew thoughtful. ‘Now...