Death March kara Hajimaru Isekai Kyusoukyoku (WN) - Book 6 - 6-3. Strengthening

[Love After Marriage]In order to avoid an arranged marriage, Shen Yin, the young miss of a prominent household, jumped into the water in protest. When she opened her eyes again, she found that the world had become fantastical. Not only was she naked, but she was also lying in a large white tub. Just as she thought she was dead, she was told that she had a child and a husband. She tried to regain her clarity.

In the heart of the Azure Continent lies a legendary establishment known as Origin Mall.This extraordinary store offers goods beyond imagination: a sip of its cola can instantly replenish one's vitality; its spicy snacks grant the strength to overcome powerful foes; the games it offers can accelerate cultivation progress; and its novels impart profound techniques and insights.Origin Mall boasts a vast array of offerings, catering to leisure, entertainment, dining, and training needs alike.However, there’s one rule that all visitors must remember: never cause trouble in the store. The owner, though unassuming, is unimaginably powerful.

[You have been killed by the Hero of Light.]

[You have died.]

I had died at the hands of the main character in the novel I had read before.

But I got another chance. I regressed and returned to the time when I first entered this novel world.

Once again, I live in this novel world as an extra character.

Since I have experience and knowledge, especially my World System which had upgraded, I'll do what I want to do.

I will become stronger than the main character.

He—an enigmatic and cold-blooded soldier with a mysterious background.
She—a ruthless and bloodthirsty spy.