A group of Slavic wanderers seeking a quiet refuge comes to a border Chinese village in the tenth century AD, whose story is truly amazing, because in three days they covered a huge distance of thousands of miles. Residents warmly welcome people, among whom is one boy, who later became friends with a local man his own age. Their friendship grew stronger over the years, and when the Tang Empire was attacked by the nomadic Huns, they together wanted to save the country from defeat. The idea comes unexpectedly - from an ancient Chinese legend about the mythical Tibetan country of Agharti, which is ruled by a wise old man: he will help the young men in their endeavors. So, friends, taking truth and honor into their arsenal, set off to Tibet to look for an underground country in the name of saving the Empire!