More details spoilers

Spoiler
Credit to lazynoodles



THE GODDESS
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So the goddess when she was still naive and loved all her creatures equally got to know the og!sinner(Catherine). She convinces the break her powers into pieces to help the world she so lovingly created. The Goddess couldn't tolerate the thought of harm coming to her creations - did so.

It was then the og!sinner(Catherine) said she was going to borrow it and went down to the world to scatter it. Absorbing one piece for herself. Since for the humans what she did was a meritorious act that granted great prosperity to them she became famous and rich from the power that was scattered and the power she absorbed.

She died with great power, acclaim, and riches. The Goddess now crippled, weak, and betrayed sees how her power is being abused. The world she loves distorted. With enormous effort calls the MC's soul to her and downloads her into the body of a villainess with knowledge of the "book." So when the Goddess said that Catherine was the beginning of the end and the MC is the start of a new beginning it wasn't a falsehood. Now the Goddess is whole with her own power again. She can forgive humans because she adored the MC and give a special exception to Harry because he aided her with all the tasks given by her to MC.

THE GODDESS IS EQUALLY COLD.
She pretended to be a Priest and outed Catherine as a horrible sinner calling forth a black smoke that emanates from her soul. The Goddess curses her to live an unhappy, frustrated life, and unable to understand why... for many lifetimes to come. Catherine collapses. This is after Catherine tries to accuse MC to be a witch, but instead sees her get blessed by the Goddess to become a mini Goddess instead.

EMPEROR
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 As revenge for harming Harry. She revived the dead Emperor but left him totally crippled and NOTHING will work on his body. No magic, no human medicine, no potions. NOTHING. She's going to leave him like that while she destroys all his hopes and dreams.

Catherine’s fishery
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1. Cassian that is some love and devotion. Despite everything Cassian still marries Catherine!
Edit: Nope they didn't get married Catherine entered the monastery to search for the reason why she was punished. Cassian is still waiting for her to return to him so they could get married

Because he was talked into it by the Emperor. The Crown Prince was still waffling but said the MC might be a threat. When he heard that he thought about the OG!Heroine and how he wanted to protect her. MC knew the Prince is too weak-willed in reality and has no backbone. Also, unlike the Emperor, he showed real embarrassment and remorse. Also, unlike his older brother who already earned the MC's trust and gains power in her court is a much powerful Duke than himself. Something he has to deal with for the rest of his life. The shame and the realization that even compared to his brother he isn't that great. On top of that, he waits for the OG!Heroine to get out of the temple. From the end of the main story. He is still waiting. I think it's a double whammy his love will never be fulfilled. Thus, in a way it is pretty fucking awful for him.

Why the fucker's life sux:
- He will never be the King.
- He learns he was never the rightful king
- The brother he thinks that he was always better than beat him in politics and earned already a place of trust in the new government.
- He sees under the MC's rule that the Kingdom become more powerful and accomplished in her short ass tenure of 20 years as Emperor than he could ALL HIS FUCKING LIFE.
- His chosen waifu has issues and has locked herself away in a Temple for the rest of her life due to the Goddess's curse. While he pines away for her.
- It is implied he basically has no presence anywhere in anyone of importance's life. Which must suck for a guy who loves himself oh so much.

2.1st Prince is wish of staying alive. The only reason he wanted to be King was due to the fact he felt it was his only way to be alive. Following MC as a Marquis of her newly established kingdom get him that and more. So he’s out of the fishery. 

3.Luke gets more of a challenge (MC is always almost killed or kidnapped) and better pay when around the MC. So no he is out of the fishery. 

4.The prime Minister was also part of the fishery but he gets schooled up North. So he has other things to worry about than Catherine so he is out. 

5. The Knight feels more at home with himself after being told his voice is wonderful. On top of that she is the owner of the Holy Sword. In his eyes she is the rightful King. He follows her because it fulfills him more as a Knight. He was long out of Catherine’s fishery. 

MC doesn’t really care about any of them as long as they don’t bother her or <3Harry<3.

CATHERINE
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MC removed the power from her body in the sewers when the OG!Heroine was on the run. 
MC was like:"I will rip out the power from your heart. Show me your chest." The
OG!Heroine: YOU'RE GOING TO KILL ME.
MC knocks heroine unconscious puts her hand over her heart sees something shiny move into her. Later, goes to the temple to return the power.

****the curse/black smog already existed as soon as the OG!Sinner stole the power - it was temporarily neutralized because of the goddess's power that she had on hand. What the Goddess did was basically rubbing a naughty puppy's face into its own mess but exposing the curse to the OG!Heroine/Catherine. The grudge is strong in this one.

The reason why MC was chosesn by the Holy Sword at all because:
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1.) the goddess chose her to correct the chaos caused by pieces of her heart
2.) clean up corruption
3.) correct the things that were twisting nature like the freak storm that harmed Erel earlier on

Once the MC retired so did the Holy Sword where he was put back in the place where MC got him from there he waits for a new time of Chaos and a new "Hero"

HARRY
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Harry is so cute and innocent. On the day of the coronation, he hears MC proposing marriage to the dwarf girl that works for her because it's a dwarf's ability to seek and find gold mines. For the coronation present, she gifts it to MC and tells her not to worry over the national budget since she will be supporting her. Harry in a cute bout of jealousy starts competing and said he could bring down the stars in the sky right now.

MC shuts it down and was like - if you could give me the stars why not diamonds?
The dwarf girl is all - it must be tough having such an innocent man to protect~
MC is all - he's so adorable I can't but want to tease him!

Also, many spirits give blessings on Harry to make sure he is able to be fertile enough to conceive children. LOLZ.

EDIT: HARRY TOOK ON MC'S LAST NAME WHEN THEY MARRIED!

CHILDBIRTH
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Due to seeing MC struggle so hard during childbirth. Harry decides to research how to get men pregnant from a woman.Both the Prime Minister and the assassin help because it both helpful to governance and amusing respectively.

Even though Harry gave up after 3 years the things he researched were of enormous help to the populace and the rate of mothers dying during childbirth by a significant amount. Due to his enormous help, the general populace prays to him as the God of Fertility and the God of Safe Birth.Especially, in front of his picture.Harry on the other hand mourned at his failure and shut himself up for 3 days. It took MC coaxing him. To get him happy again.

Even when he wanted to surprise MC for her birthday he couldn't do it since he has been making so many grand cakes and personally cleaned the kitchen after himself. When the MC teased him about it he was nonstop hiccuping for a long time. However, his cake was so bad when their daughter Charlotte ate it she passed put from food poisoning for 3 days.

HARRY x MC' DAUGHTER
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The daughter Charlotte wants to marry the powerful black dragon Ran. A dragon that the MC and Harry are raising to be their “son.” From what I understand the black dragon is kinda like a more well-behaved version of Harry. Still very innocent when it comes to love, but doesn’t need slaughter/sex. At first the black dragon kept saying to Charlotte he is her older brother. Then Charlotte inadvertently confesses her plans of marriage since she had no idea at age 9 that the dragon and Ran were the same being.

MODERN WORLD
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In the modern world MC finally gets her wish since when Harry was summoned he was wearing a really lavish outfit. He wanted MC while she died to remember him as someone who was the most handsome in the world. All over his one-of-a-kind bespoke suit were diamonds EVERYWHERE. All of them perfectly cut without a single flaw. MC sold all the diamonds and now has a shit ton of money. She even threw her resignation letter to her boss's face. In modern times, she accomplished all her wishes. Retire young, have a shit ton of money, throw her resignation letter in her boss's face, and of course, have Harry by her side.