In their past life Xing Yue (blue hair) betrayed YuLang (black hair snake demon). YuLang entrusted his inner core to Xing Yue and Xing Yue gave it to the emperor to consume because the emperor is gravely sick and the only remedy is a demon’s inner core. However, YuLang saw through this and I believe killed the emperor and took over his body which gave YuLang eternal life (immortality). He holds a grudge against Xing Yue for basically a thousand years and waits for him to reincarnate before reminding him about the pain Xing Yue gave him, because despite knowing that Xing Yue was faking his kindness, manipulating him, and betraying him, YuLang still loved him…At least, this is what i interpreted, hope this makes sense :)
omg tysm
holy the art is so beautiful but im lwk confused about whats happening in the story