How does Sophia help the merfolk of Thalassia?

She sends modern supplies and knowledge through a bottled ship portal.

What threatens the portal connecting the two worlds?

Deep-sea leviathans cracking the bottle from inside and a shadowy figure hunting Sophia.

My Bodyguard Is a Prince from Another World

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My Bodyguard Is a Prince from Another World — Sophia uses a bottled ship portal to send modern aid to a dying undersea kingdom.

An antique bottled ship in Sophia's possession becomes a conduit to Thalassia, an undersea civilization collapsing into ruin. She funnels contemporary resources and knowledge through the narrow opening, reversing the kingdom's decline and earning the merfolk's reverence as their Storm Goddess. The fragile connection deteriorates as colossal leviathans assault the glass barrier from within, splintering the passage between worlds. Simultaneously, a mysterious pursuer closes in from Sophia's side, intent on seizing the cross-realm knowledge she controls.

Quick answers

How does Sophia help the merfolk of Thalassia?: She sends modern supplies and knowledge through a bottled ship portal.
What threatens the portal connecting the two worlds?: Deep-sea leviathans cracking the bottle from inside and a shadowy figure hunting Sophia.