everyone has their own story, and every land has unique vitality. in the cold arctic circle in winter, in the extreme night when there is no sunshine all day, there is such a group of people who live for different reasons. for life and ideals, they flash in the vast ice field, emitting unique light, either shining themselves or illuminating others. aaa。 the film is based on light, from the light of science, the light of humanity and the light of divinity, tells the story of people living in the svalbard islands. different races, different cultures and different beliefs blend here, inherit and continue in love and love, show the beauty of human nature between reason and emotion, and coexist harmoniously between man and nature, and each of them is a "light speaker". in october 2017, liu yang, a phd in space physics in my country, embarked on his second polar journey. this time, he will be stationed alone at the yellow river station in the arctic of china, responsible for the observation of the polar spatial environment. arctic yellow river station is located at 78 north latitude °55’、era 11 °56’new orsson of svalbard, norway. from october to march of the following year, new orsson is in a completely polar night state, which is most conducive to continuous optical observation. there are scientific research stations in the town that belong to different countries, and the yellow river station is an independent two-story building where liu yang will spend 120 extreme nights alone. loneliness is something that liu yang must face every day. the town with only 30 people is a small country isolated from the world. in this country, his daily job is to turn on and off the three all-sky aurora imagers and an aurora spectrometer, data inspection, and operation and maintenance of two magnetometers and cosmic noise receivers. the town is like an orderly courtyard, and everyone maintains a friendly and appropriate sense of distance. in addition to the daily meal time and weekly exercise time, we are usually more alone. in february 2018, liu yang welcomed the chinese lunar new year alone. he planned to use chinese traditional customs and culture to warm the cold extreme nights of the town. there is also longyearbyen to the south of the town, where a group of cheerful "northmost residents of the earth" live, with regular yin and yang sides, and they are light speakers in another sense. at the beginning of march, the darkness that lasted for 4 months will be broken by the dawn. the "light speakers" will hold a grand carnival to celebrate the "sun festival" to welcome the first ray of sunshine of the new year. in the same time and space, light is the clearest belief of a person and a group of people.