Correspondence between Andrei Bely (Boris Nikolaevich Bugaev, 1880-1934) and Alexander Blok (1880-1921), covering 1903-1919, reflected not only the history of the relationship between the luminaries of Russian symbolism, but also the main stages of the sovereign and intertwined paths of writers. This is a true romance in letters - confessional, intellectual and dramatic. The poets corresponded before they met. They brought together the romance of the Dawns, the cult of Eternal Femininity, inherited from Vladimir Solovyov. Faith, poetry, creative self-determination - everything was discussed in epistolary dialogue. A confidential exchange of poems, the course of philosophical reflection, literary plans and publications, “the topic of the day,” a travel story - everything forms the unintentional plot of the Correspondence. At the epicenter is an explosion of passions: unheard-of drama fills the letters at the height of the Mystery of Love experienced by the poets in reality. The heroine wife of Alexander Blok is Lyubov Dmitrievna Blok (née Mendeleeva, 1881 - 1939). The psychological collision almost incinerated spiritual intimacy. But Alexander Blok and Andrei Bely were “children of the terrible years of Russia,” “brothers,” and neither personal strife, nor wars and revolutions could separate the poets. The evidence is the long-term Correspondence. Being a biographical, human document, the Correspondence is also an outstanding literary monument that has absorbed the key moments of the artistic and spiritual quest of the early 20th century. A complete set of letters from Andrei Bely and Alexander Blok known today, addressed to each other, is published according to primary sources and without cuts. The commentaries are equipped with the latest research, taking into account the experience of domestic and world literary criticism since the publication of the first edition of the Correspondence (1940), prepared by Vladimir Nikolaevich Orlov (1908 - 1985). The Appendix includes Correspondence between Andrei Bely and Alexander Blok’s mother, Alexandra Andreevna Kublitskaya-Piottukh (née Beketova, in Blok’s first marriage, 1860-1923), who lived with the anxieties and trends of the Silver Age.