Under the cherry blossoms that year, he met her before she was born. A hundred years later, he watched her break out of her shell, his heart filled with joy, and he unknowingly fell in love at first sight. The dragon is a free spirit, but she made the dragon clan's most sacred contract for him. The wheel of fate never stops moving forward, but her existence changes his life. His world is no longer just a cold tundra, and he can take off all his masks in front of her. He was irreplaceable to her, he was her knight, she could act coquettishly to him, she could sacrifice her life for him, all this was clear to her from the moment she opened her eyes. Eternal life brings eternal love. There is no suspicion between them, but only full trust. The danger is always unknown, but they will always be together and become stronger. They will change, but the connection between them will not. They will grow and find other things that are equally important, but their eternity will never waver. They will live and die together... It has nothing to do with the contract itself, just because of the love in their hearts. It has nothing to do with anything else, just because he is her knight and she will always be his little dragon. The iceberg boy gradually grows up, and the cute girl will eventually learn to take responsibility, feel the heartbeat of the other person, and will no longer be confused. "If you want to protect, just let go. I will be behind you and wait for you." This is the girl's persistence. "No matter how you change, you will always be Ji'er, the only one I cherish." That was the young man's promise. Their story is like a rainbow, extending to a beautiful and endless place, a fairy tale that goes on forever...