Back when Zhang Yang was still roaming the Beginner's Village as a fresh young greenhorn, he had already accepted a main story quest about the Demon Lord, and the Fallen Wind Ranger Calina. However, due to the outrageous quest requirements, he had prolonged the quest until he was Level 100 to gather the required items. After that, he had accepted the quest - "Quell thy Anger" where he was given a quest item to use on Calina to finish the quest.
It may sound simple, but would a Celestial tier Demon boss let you touch her *ss? Back then, before the killing of Kenzack, the system had not revealed the location of Calina, and that was why Zhang Yang had completely forgotten about her. However, when he saw the information about the nine Demon Lords, and the Seven Spectre Kings, his took note of Calina and was ready to resume his quest.