K'un-Zi (焜滋) is a mystical city located in a pocket dimension, and one of the Seven Capital Cities of Heaven. It was ruled over by the Crane Mother and was known for its people's use of dark magics, and it is protected by a line of warriors who bear the name Crane Warrior.
In 1933, a meeting took place with all seven lords where she accused Iron Fist (Orson Randall) of sullying tradition because he refused to participate in the Tournament of the Heavenly Cities. In each city, an immortal weapon, such as the Iron Fist, fights for his city in the tournament. The battles in the tournament decide the order of the cities of the heavenly timeline. All council members except Lord Tuan (Yu-Ti), the leader of K'un-Lun agreed that Randall should pay and face punishment. Randall would be confronted by the Immortal Weapons and he ended up killing the Crane Champion, the Immortal Weapon of Ku'n-Zi. Randall would elude capture and Crane Mother had a personal vendetta against him ever since.
Many years later, the she resurrected the Davos and charges him with finding and assassinating the Iron Fist. Crane Mother would provided Davos her Crane Daughters to assist him and grant him enhanced powers by draining their chi whenever needed. He joined forces with Hydra to help him in the hunt. Randall informed Iron Fist (Danny Rand) that she had sent assassins to kill them both. The assassins ambushed Randall and Danny. Randall gave Danny the Book of the Iron Fists and told him that he would need it for the tournament before he died. Yu-Ti and Lei-Kung came to Danny after Randall was killed, they tell him of his fate to journey to the Tournament of the Heavenly Cities. Danny mediates by the Scrying Vessel of Bo-Ling (which appears as a pond filled with lotus plants). Danny asks the Vessel where Jeryn Hogarth is and is told that he is in K'un Lun. Danny is taken to meet his opponents, which include Davos. A preliminary fight is drawn which opens the tournament. Fat Cobra entertains the gathered by defeating the 100 Shaolin Terror Priests in the exhibition match. Because he wins, he is allowed to select his opponent for the first match of the tournament and he chooses to fight The Immortal Iron Fist.