For thousands of years. The Demons and Immortals, with the help of the five goddesses fought with one another, because the immortals protects the mortals from the demons to be conquered by the Demons. To stop the endless rivalry the five goddesses made the heart stone which consist of the infinite power. The only chosen one can use to protect the whole humanity. The stone was placed in the sacred temple which guarded by the five Goddesses.
Many years later, in the land called Penglai, Penglai was the capital city of the Immortal Realm. It is the place where their Immortal Emperor live together with his Royal Family. In Penglai, both the Immortal Empress and the Immortal Princess gave birth to two babies named Princess XiuYing, the daughter of Immortal Emperor Fu and Immortal Empress Ming Yue. While the other baby was named Xiang, the son of Immortal Princess Chen and Immortal Prince Kai. But unfortunately, Xiang was kidnapped and his parents were killed, and he was brought to the Demon Lord named Lord Wang Lei.
Many years passed, the people began to lose their faith for the Immortals and started doing bad things like killing. Because of this the Immortal's began to lose their powers. Some of them died and some of them unable to fly again.
One day, Goddess Da and Goddess Lai visited the immortals and said " There are two babies that was born in the same day and time, but separated by now." " Ying And Yang was the key to the peace."
Now, in this day, Princess XiuYing was all grown up, together with her three elder brothers Prince Hu, Prince Zhang Yong and Prince Bambang. Princess XiuYing was the youngest and the only girl. She is helpful, beautiful and brave. Meanwhile, at the Demon Realm, Yao grown up and become the successor of his father to the throne.
One day, while princess XiuYing was at the crystal cave, she feel strange, her head aches and she saw that someone's watching her from behind. But she ignored it for a moment, but can't shake of the feeling, so she rushed home and swear to herself that she will never go back to that cave again. It was still a mystery for her afterwards.
Many months passed, the princess couldn't sleep tossing and turning until the wee hours of the morning. What happened in the crystal cave lingered in her mind. She even dreamt about it in her sleep. So, she decided to seek the help of her brothers. Her brothers upon seeing how serious she was, listened attentively as she relates to them what bothered her." When I was in that cave, I had a strange feeling that someone is following me and watching from behind. I still have that feeling and I always feel uneasy about it. Since then, I can hardly sleep at night. When I do, I dreamed about it... All the time. So, help me dear brothers. Prince Bambang contemplated the matter over, and said" You need to go back to that cave and find out what's that "thing" and what it wants. "What?!!!"Asked Princess XiuYing."You want me to go back to that cave and risk my life? Are you crazy?". She really can't believe her brother could suggest such a horrendous thing. "You need to conquer your fears, my dear sister." Prince Bambang said. " Does she really need to go there alone?" Prince Hu asked. " Yes!" Prince Bambang said gently. " I must think about it." Said Princess XiuYing. After an hour of discussion, Princess XiuYing excused herself and said she would go to bed. While her three elder brothers continue their discussion.
The very next day, Princess XiuYing woke up early and packed her things. She leave a note in her room and left. Afraid yet determined, the princess set out to her quest. Once again, she's back in the cave. She braced herself and enter the cave cautiously. When she reached the center of the cave, she was mesmerized by its beauty. She looked around and admired everything she was seeing. Suddenly, she heard the roaring sound behind the mist. She shrieked when the "thing" approached in front of her. It was the ferocious dragon named LongWei. The creature that protects the Demon Realm from anyone who trespass. " You're trespassing young lady. This is not a place for an Immortal like you so go now before I change my mind and eat you instead." " I'm not afraid of you!!!" Princess XiuYing shout and by that the dragon blew out his fire breath and because of fear to be toasted and roasted she run for her life, but unfortunately, she fell down deeply down the cave were she found a light that lead to the small town called Chengtong Pass wherein the mortals live their life. She was mesmerized of what she saw. While Princess XiuYing was wondering around she bumped into someone. " Hey watch where were you going. Are you blind, deaf or just a stupid person who didn't know how to say sorry!!!!!!!" The boy said angrily. "I'm sorry, I didn't mean to." Princess XiuYing said. Before the boy could say anything, he was mesmerized by the beauty of the princess. " Oh! It's ok I know you didn't mean to. I'm sorry for what I said. I'm Àilún by the way. And you are?" "I'm XiuYing, nice meeting you Àilún." She answered. They had little conversation and went to their separate ways. As XiuYing keeps wondering she noticed that the mortals were not all good because she witnessed how the people kill each other without minding that someone is watching them. She never expected this would happened to the mortals. She dreamed it to be the perfect place where the people love each other and not killing each other. These scene makes Princess XiuYing more worried.