This is a comprehensive time travel between modern and ancient times. The three sisters have experienced experiences in modern times, and accidentally obtained gems while performing their duties, and traveled through time; in ancient times, they suffered hardships to complete their mission.
Night/Ye Lingqi's gemstone is green, cold but full of life. The light warms the leaves, the leaves protect the light, the rain moistens the leaves, and the leaves also give the rain the ability to regenerate. When the night gets dark enough, the stars will shine brightly. The spirit of night is the same as that of leaves. Although it is cold, it is indispensable.
Yuyun Fengyao's gem is blue. Rain is an elf, light and beautiful. Blue gives people a soft feeling on the surface, but in fact it is a cold color and has a deserted feeling. This dual personality suits Yun Fengyao just right.
Light Bei Xiaoai's gemstones are transparent crystals that can reflect colorful light, and they are synthesized into sunlight. Xiao Ai's smile is as bright as the sunshine, and her character is as unpredictable as the various colors.