My Billionaire Great-Grandfather is 18

Charles Forster wants his family's standing back and has nothing to work with. Eighty years ago he ran one of the great business houses and was a hero in the war, and he died shielding his daughter. He wakes up in the body of an eighteen year old who has been cheated on and humiliated in front of everyone, with no money and nobody on his side. The daughter he died for is eighty now, and she calls him Father. He starts taking the family's name back the way he did the first time. One punch is enough for the cheat, and the traitor inside the family takes a kick. A CEO who had no time for him goes down on her knees, and a star everyone knows begins throwing herself at him.