I Am the Nanny of the Villain - Chapter 110:

Deep below the earth's surface, a mystifying subterranean seascape lurks, an archipelago bathed in inky blackness where suspense and horror hold court. Here lie strange islands and even stranger monsters, far beyond the realms of human imagination. In this domain, mankind is far from dominant; instead, madness and death rule supreme.

Pleading for mercy from the unknown creatures of the deep only leads to a slow, tortured existence. The trapped survivors gradually distort, losing what made them human, both physically and mentally, to the gloom as they remain trapped in this eternal obscurity. Their only hope? A perilous expedition into uncharted sea territories.

Fueled by determination, Charles embark on this daunting voyage aboard his steamship, aiming to reclaim humanity's past glory. Together with his crew, they sought a way out of this hidden sea world, a path back to the sunlit world above, where humans once stood tall.

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I read a few comments from Chinese readers that compared this novel with Lord of Mysteries because of similar elements: Lovecraftian, western fantasy, first industrial revolution, and steampunk. However, I have yet to finish reading Lord of Mysteries to do any actual comparison, but I do think those who have enjoyed that novel would enjoy this as well. Also, the author of LotM, Cuttlefish That Loves Diving, also did a shout-out for this novel, so I guess he approves of it too?

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Dear readers! Without any ads, maybe you will prefer .

The story is about a boy entering high school, who answers a strange call from a public phone one night. The caller challenges him to a bet: She’ll remove the birthmark which he sees as the cause of so many problems, and he’ll have fifty days to win the heart of a girl he’d considered far beyond his reach. And with this, a very strange summer begins.

A man was transported to Ancient China and eventually became a servant of a declining household without a male heir. He utilized his wits and modern knowledge to help the household and eventually become trapped in the sea of political turmoils of the period.

- Description from Novelupdates