I'm Called the Founder of Science Fiction

I didn't like him in my previous life, but I slapped him in the face after my rebirth. Actually that's true In his previous life, he died in a battle, but his soul never returned to heaven for a long time. Later, his sister wanted to get married, but his sister ran away with her lover. So he married her sister. In the end, our hero was reborn. He fell in love with him and never regretted falling in love with him. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.