The six men of Young Master's Elite received quite the scare upon seeing the mess that High Cloud was.
It was not possible for all seven hundred fifty members of a level 5 guild like Traversing Four Seas to know each other, but since there was an item like an emblem that could not be faked to prove a member's belongingness into a guild, whenever there was a group PvP, no one would mistakenly kill or be killed as long as he or she was wearing the said item.
