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About 1,300 years ago in the Tang Dynasty, there was a poet named Du Fu. I met an old friend again and wrote a poem "To the Eighth Guardsman" to express my feelings about life. The poem says: Life is not about meeting each other, but it is like participating in business. Tonight or any other night, we share the light of this lamp and candle. How long will it take for you to be young? Your hair will already turn gray. Visiting the old half-ghost, exclaiming that it is hot in the intestines... Rigel among the seven constellations of White Tiger in Xiguan, and Heart among the seven constellations of Canglong in Dongguan... The two appear and disappear in the starry sky, and each other appears and disappears... Relatives separated by yin and yang are like the ginseng and merchant stars that will never meet in the night sky... However, the universe is constantly changing and changing... Today, more than 1,300 years later, electronic science has developed rapidly... It evokes a love affair separated by yin and yang... Or is it a dream?...