If the Universe is infinite, what is the probability that similar worlds exist in different parts of it? Perhaps in one of them you are happy and living the life you always dreamed of, without regrets, with confidence in your own future. Perhaps the sky is even a different color there, and the stars form unknown constellations, and only one of them is familiar to you. Mingyu never thought about what his life could have been like if he had been born in another time or in another world. He is sure that for him the outcome will always be the same. The Universe thinks differently when it gives him a chance to touch another reality. On the other side of the mirror, the sky is a really unusual color – lilac. But there are no closest friends there, and the only one who can help is the neighbor's child, who is ten years older in this world.