I haven't read the novel, but i read the synopsis. It was a Chinese novel that involved him going back in time for some reason and he had a girl he loved. If i remember correctly when he went back in time he started training super hard so she wont die or something. Edit: its not TDG
Limitless Sword God is death, soul into the past setting, Tales of Demons and Gods is as well. Both are good series and both involve going back and hoping to save the people they love from death. Since you liked Limitless Sword God, you'll probably like Tales of Demons and Gods as well.