Fantasy: After Rebirth, I Became a Mobile Blood Bank

The world's top killer was reincarnated and became a second generation ancestor. He was actually punched into unconsciousness by a teenage girl! ... ... After getting a tower of pearls, I thought I would have an adventure in another world and become the king! Who would have thought... The first level, a drop of blood essence opens! The second level, one hundred drops of blood essence is activated! The third level, Thousand Drops of Essence and Blood is activated! Poor this lone wolf killer, he lost his blood before he even got out of the attack! After all, can I go back in this life? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.