A general has to marry a girl, but she runs away and her sister takes her place. He was very furious with her but little by little, after discovering that this girl was his savior when he was a young prisoner he falls in love with her. It's nice to see their relationship grow.
But the convoluted story, all these poisonings and the length of the series (40 episodes) make it a bit tiring.
Above all, I didn't like the last 3-4 episodes because he changes his attitude, teams up with the bad guy, gets divorced and doesn't bat an eyelid at people who died unjustly.
Even if it turns out that he secretly acts on behalf of the empress to set a trap for the villain, the price was high and made his beloved suffer.
All this, however, will give him the opportunity to discover the truth about his father's death and will rehabilitate his family's name. After that he does everything to win her back.