Becoming An Ancestor In Another World From This Day On - Chapter 56 - Arrival

Liu Ling, an unmarried activist, has been unrestrained all her life. Before her death, a friend asked her if she had an unfulfilled wish, and Liu Ling replied she could not raise a baby.

The friend fell into trouble; this is not easy to do. Not waiting for her friend to speak, Liu Ling said that if she gave birth to a child, the mother would die, and her child would live, so let’s forget it.

Unfortunately, God heard.

After her death, she did not enter the underworld and transmigrated into Song Zhaodi. She also had seven children, all of whom were not her own.

- Description from Novelupdates

15 years ago the world discovered magic as well as mythical beings (basically beings from various legends) in another dimension. Humankind learned to summon these dangerous mythical beings and use their power to great effect. Seven countries formed contracts with these “mythical beings” and gained their allegiance as a result. The mythical beings will choose their summoners on their 14th birthday and give them a stigma. Schools have been set up to train summoners and magical swordsman (basically bodyguards that give the summoners time to cast their spell) as a result.

15 years later after the finding of magic Kazuki Hayashizaki is chosen as a summoner and given a stigma to indicate that. This is surprising since males aren’t chosen as summoners due to their low amount of mana compared to females. As the first male to be a summoner Kazuki is under a lot of scrutiny by almost everyone.

To complicate matters his sister (who’s a magical swordsman) is against him going into summoner school to train there as a summoner. Because summoners and magical swordsman have a cat mouse thing going on where summoners look down on magical swordsman as inferior so his sister naturally is against him going there. She’ll stop him even if it means going to war.

Kazuki however is determined to thrive in summoner school and has already determined to give it his all. Even if he’s the lowest ranked student (ranked E) and his fellow students intend to demean him he’ll prove himself as the strongest summoner.

Ling Ran, a med school senior, begins to see the world like a game UI. He uses it to pave his way towards graduation, a residency, becoming the greatest doctor in the world… And finally getting a Transformer from his newbie packs? Maybe. We don’t know yet.

It was only after Su Yayan's death that she realized that she was a malicious cannon fodder female character who became a scapegoat in a Mary Sue story.