I notice the phrase you provided—“mortal 39-s journey to immortality 73”—appears to be a mangled or encoded version of a title, likely referencing a chapter or volume of the popular Chinese web novel A Mortal’s Journey to Immortality (《凡人修仙传》). The “39-s” probably means “39’s” (as in belonging to chapter 39), and “73” may indicate page 73, chapter 73, or a mis-typed section number.