MTL - Shoujo Grand Summoning - ~ 041 tells the existence of the sister-in-law...

Tiara was killed in the real world and then reincarnated to live in the body of a noblewoman in the novel she read named Claudia Ambelynn. When she lived in the novel world, she was reunited with the main protagonist who was her husband who was killed in the real world. In addition, she also met the murderer in the novel world and also played the role of the main protagonist's older brother who was known as the most cruel character. It was not that easy for Tiara to live in the novel world written by her husband. She had to carry out a mission that she had to conquer the heart of the antagonist, Duke Harry, in order to return to the real world. This made Tiara think, if she lived in Claudia's body and married Harry, then she could take revenge on the murderer who killed her husband in the real world. The way to do that, she would try everything so that Harry would really fall in love with her. She was forced to cancel her engagement with Duke Harris in order to take revenge on Duke Harry. How did Claudia succeed in conquering Duke Harry's heart?

In childhood, they were neighbors. Xie Zhen always bullied Li Yu.

Who told him to be as beautiful as a girl?

After parting for many years, they met again in the capital. With a tall stature and heroic bearing, he seemed like a completely different person.

Not only that, but his identity had also risen to that of the sixth prince.

Hearing he wanted to marry her, Xie Zhen was almost scared silly:

Σ(っ °Д °;)っ What’s his intention? Taking revenge on her?

- Description from Novelupdates

Hoarding top-tier baddies, stealing people's wives, and cucking kings and emperors. That was Dapper’s daily routine. Life was sweet… until he caught the attention of the system enforcers.Liam, a teenage thief with a twisted way of thinking, died in the middle of a high-stakes heist. But just when he thought it was all over, he met a god, a failed god, who granted him a glitched system.Reincarnated into the body of a meek teenager named Dapper, Liam finds himself in a world ruled by magic, systems, and mythical creatures. This time, he’s determined to live the life he never could in his old one. The wild fantasies he once harbored are finally within reach… but at what cost?