It is the second film in Kim Han-min's trilogy about Admiral Yi Sun-sin, following The Admiral: Roaring Currents Where to Watch Legally

Mara realized the lantern wasn’t just a decorative piece; it was a conduit for the memories and hopes of those who had once looked to the sea for guidance. She placed the crystal lantern in the lighthouse’s lantern room, and as she lit it, a gentle, golden glow spilled over the fog, turning the mist into a cascade of sparkling light.

Source: WEBDL (a high-quality rip from a streaming service). Year: 2022. Legitimate Streaming Options