Reborn as a Flood Dragon: taking a female Sword Immortal as disciple

After a day of hard work, Zhou Zaizhi, a surgeon in training, freshly graduated from university, died in his sleep. After investigation, the police concluded the cause of death as: Heart attack. Due to pulling all nighters frequently to met the deadlines on assignments, keep up his studies, and to wake up in time for his rounds in the hospital, Zhou Zaizhi had developed two bad habit: microsleep and reliance on energy drinks. AFter a year and a half, his frail body that was getting weaker by the day due to the lack of exercise finally gave in. Zhou Zaizhi died alone in his rented room silently, pitifully. When he opened his eyes again, Zhou Zaizhi found himself in a dark cave smell of blood and decay. He looked at his body and was shocked to find that he was no longer human. After he came out and investigated for a while, he found out with hollow laughter was that he seemed to had been reborn and possessed a flood dragon. What made him despaired was that he seemed to be hated by all, shunned by all. And that was not the worst of it. The longer he lived, the more he found out a terrifying truth: There seems to be many old monsters lurking in the dark, constantly whispering words of deceit to his ears, controlling the tide of the world. "How am I supposed to survive like this!?" Turning to look at his youngest disciple that he took in a few decades back, Zhou Zaizhi felt a sense of relief. 'As long as I have this disciple, my survival is certain, Nascent Soul is in sight!' He thought happily with such optimistic world view, how innocent. It was a beautiful woman who seems to be in her early twenties. Instead of delicate flowing silk robe, this woman instead wore fur coat with light, Mountain Patern Armor. Her name was Wan Zhaolu. Zhou Zaizhi sighed, "Lu'Er, why are you wearing your armor all the time? Isn't it uncomfortable? You should try wearing that silken skirt little Xiao gave you the other day." Wan Zhaolu who was wiping her sword looked up at him with a trace of anger and annoyance hidden inside her eyes: "Master, you know Xiaomiao?" Zhou Zaizhi tilted his head slight, he replied: "Of course? She's your friend after all." Wan Zhaolu sighed and was about to turn back to cleaning her sword when she heard him continued: "Or you could try this dress little Jinghua gave me. Sighs, why did she even give me such a thing? It’s not as if I can wear it." Wan Zhaolu snapped her head back at him, " Who is this Jinghua? Is she a woman?" "Huh? She is Yisong's junior, she visited us a few months ago remeber? She even introduced me to her master and aunt aunt maste-" Zhou Zaizhi's words were cut off before he could finish, a sharp blade had already appeared beside his neck at some point in time. "You know other women!?" "???"