Aww... It's a cute baby dragon. It enjoys gathering pebbles and other small rocks and putting them in a pile.
And look! It's grown its wings! It must be close to maturing.

Young dragons are relatively defenseless. Their scales don't grow in until right before they mature, and they have almost no strength. Once a hatchling's wings grow in, it marks the beginning of maturation. At this point they are usually left alone by their mother and begin to hunt and survive on their own.

South Korea is a purebred Green dragon.  Due to the popularity of the pool his father, Clint, initially dug for the Water dragon, Christian, South Korea helped enlarge it.  The cave has also gotten too small for the ever-increasing population, so South Korea has helped his parents dig out the back wall.