Reincarnated in my vampire system

Disclaimer:I do not own the novel my vampire system Full credit to JKSManga 23 old Rayne was a medical student who was trying to develop artificial blood and had isolated himself from all of humanity but died due to over exhaustion leaving it midway but luckily his sister completed it. But later when Rayne woke up he found himself in a completely different world which he has no idea of will he survive this new world. Read it to find out. Caution read at your own risk follow closely to the plot