Death March kara Hajimaru Isekai Kyusoukyoku (WN) - Book 1 - 1-8. The Demon, the Knight and the Magician

Ji Yan discovered his wife, who hated him so much that she wished he was dead, had lost her memory after a car crash. She had changed so much it was like she was a totally different person…

When he goes to work: “Dear, don’t move, I’ll put on your shoes for you.”

When he is having a meal: “Dear, I have made all of your favourite dishes. You have worked hard, so eat up.”

When he finished work: “Dear, you have worked all day. I’ll massage your shoulders and feet.”

Ji Yan: “…”

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Tang Tang got pushed into the pond by her step sister who frequently bullied her. She thought she would meet her dead mother but, who knew, when she opened her eyes again, she was in a strange place. But what made her happy was that she had a super handsome husband and a very cute son. The most important thing was that her husband was good. He was a hero who protects the country, and earns money to support her and their son. Also, he only has her as his wife, he didn’t have any concubines or whatsoever. Tang Tang decided she should be submissive to her husband, to be a good wife and a loving mother. Her nanny no longer needed to worry about her not being able to get married anymore!

- Description from Novelupdates

Hero Zhang Han was frustrated in life originally, but he stepped into the Cultivation World by a stroke of luck. Possessing divine natural gifts, he ascended into the disaster-crossing period step by step. He had imagined his life would not have any hardships anymore, but unfortunately incurred the god thunder since he violated the fate. After he woke up, he was surprised to find that he was reborn, going back a few years ago. He found that the world was different from what it used to be after his rebirth and he had a lovely daughter.

After getting betrayed and killed by the only person she’d loved, Miss Shang wakes up in the body of the cowardly crown prince Shang Wuxin, who, due to her own circumstances, was actually a girl cross-dressing as a boy. After inheriting the crown prince’s memories, Shang Wuxin has three things on her agenda:

1. Clean up the house

2. Gather loyal followers and soldiers

3. Get the throne

The second prince has come of age. To celebrate the advent of such an occasion, the search for a suitable bride began. My younger sister was expected to go to the Royal Palace as a candidate. However, despite this, she eloped the day before her departure. I, the older sister she left behind, looked almost exactly like her – so much that we were often mistaken for twins…

One month, right? For just one month, shall I substitute in for my sister?