Toaru Majutsu no Index: New Testament - Volume 15, Chapter 4: Despair, or an Objective Revealed — Artificial_Disaster.

An unexpected discovery in Machu Picchu has transported a young professional thief from Earth to a world filled with mystical powers and evil plots. With his beloved teacher and best friend killed during the calamity, his only goal is to become stronger, so that he can take revenge for them.This is a novel filled with politics, the struggle for power, evil beauties, and of course, Divine Immortals.

- Description from Novelupdates

Ercella lived a glorious life everyone envied, but died of an illness at a young age.

Before her death, she regretted not having become a proper mother to her son.

But somehow, she went back three years ago.

Ercella is living her second life.

I promise to be a loving mother this time.

However, is it too late?

“Now that you’re doing this, you’re just making me feel uncomfortable.”

The son only pushes her away and she realises that her relationship with the husband, who she thought was fine before her regression, wasn’t actually…

After traveling to the Tivat continent, Lin Mo became a jar merchant, and since then he has embarked on a journey of selling jars.

Lin Mo: “Let’s open a jar. Whether it’s the Eye of God or the magic weapon, you can buy everything you need. You may earn blood, but I will never lose!”

Ningguang: “As long as you sell unlimited quantities, I am willing to give you all the money, and people can also give it to you!”

Hu Tao: “Golden Emperor Fen Tianyan? Or only ranked fourth on the Yihuo list? I can’t imagine the Yihuo in front of me.”

Ke Qing: “Sword Twenty-Three? Hey, what kind of terrifying swordsmanship is this!”

Yae Godko: “Touch your tail more, can you sell me an extra jar?”

Ayaka Kamari: “How can this Zanpakutō, Xiu Baixue, be so strong!”

…..

A few years later, everyone in the entire Tivat continent was looking for the jar left by Lin Mo.

- Description from novelbuddy

It was supposed to be a perfect deal in which both parties got what they needed. However, after the child was born, he tore up the agreement with discontent and told her, “Who said that we’d only have one child? I want twins! Twin brother and sister! You’ll continue giving birth to more children until you bore me a pair of twins!”