There is a huge age difference between him and her
She was shot and killed by someone hired by her husband's ex-wife because of her property.
He couldn't love it, and watched his beloved die in front of him
He accidentally obtained the system and traveled through one parallel world after another, just to save her miserable life one after another.
World 1: (a plot with some pedigree) A man from a poor family but a genius vs. A arrogant woman from a good family
World 2: Kangxi vs Empress Xiao Yiren
World Three: Child Stars and Movie Queens vs. Pretty Girls
World Four: The Dandy Prince vs. The Tragedy Prime Minister's Daughter
World 5: (Huanzhugege) Qianlong vs. Successor
World 6: 70-year-old bastard vs. Educated young girl
World 7: (The Legend of Zhen Huan) The fourth master who was cuckolded vs. The unlucky successor who lost his son and lost his position as queen.
World 8: Farmer's Son vs. Child Bride
World 9: (When adolescence meets menopause) Family love conflict between a man and a gentle and virtuous woman
World 10:? ? ?
(To be honest, after watching many TV series, I can't remember too much of the plot, or even the name of the protagonist, so I want to read a fan novel, but I can't find it in this novel. Although I wrote some derivatives, the derivative parts are very few...)
(Some stories are derivatives, but I have forgotten some of the plots of those TV series. Maybe I will only use the plot, and I don't even know the name of the protagonist, but some of them are derivatives, so I put it in the derivatives, and the name is also written as Comprehensive Fast Travel)
Intention: For the heroine, the male protagonist travels through time and time again, pursues again and again, and searches again and again...