Naruto: I Can Take People Through the Ninja World in the Future - Chapter 542: Super-Level Attack, Five Kage Annihilated?

For the wine to be drunk on her wedding night to actually have been a cup of poison and for the one to poison her to be her husband, who would believe it?

He became a teacher at the best magic academy in the empire.
….For being mistaken for someone else.

Zheng Tan somehow returns to the year 2003, turning into a black cat. Picked up from a rubbish heap by the Jiao family, he is given the name “Charcoal”, and so begins the life inside Professor Jiao’s family. Zheng Tan remembers that he was once a person, but currently his body is that of a cat. He has no way of speaking the human language, but can understand it, and even retains the thinking and IQ of a young 20 year old youth. Read along as he adapts to this new world, and somehow tumbles from a group brawl to catching a thief.

- Description from Novelupdates

At the age of 16, Bian Yue became an orphan, inheriting a massive fortune from her family and becoming the wealthiest young heiress in Xiangjiang. The Li family, close friends with the Bian family, took pity on her and brought her to their home. Upon first meeting Li Siheng, he approached her past rows of black-suited bodyguards and tenderly offered to take her home, a gesture that would captivate her heart for a lifetime. At 22, Bian Yue managed to marry Li Siheng, but under the dim lights, he, with an indifferent tone, confessed his change of heart. Determined to part gracefully, Bian Yue resolved to give Li Siheng a decent break-up.Xiangjiang's newspapers headline the daily news, reporting that Shen Jin, the head of the Shen family, frequently visits temples due to a terminal illness and is on his deathbed. People applaud behind closed doors, citing his ruthless actions as karma. Seeing this, Bian Yue devises a plan. During a continuous downpour in Xiangjiang, Bian Yue sits in the Shen residence, drenched. In the dim light, she sees the distinctly elegant and captivating Shen Jin and hesitantly proposes marriage, to which he coldly agrees. Their marriage is hastily arranged, stirring public uproar.Meeting Li Siheng again after her marriage, Bian Yue takes shelter from the rain. Li Siheng rushes out of his car and runs to her, desperately holding her hand and pleading for a divorce so he could marry her. That night, Shen Jin, who was abroad, returns instantly upon hearing the news and confronts Bian Yue, who had just come home. Lighting a cigarette, he casts a more enchanting silhouette against the night, kissing her fiercely. He promises that the rainy season in the harbour city will end, and he will also wait for her return home.