If you loved Detective K: Secret of Virtuous Widow, try Detective K: Secret of the Lost Island
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
You already loved

Detective K: Secret of Virtuous Widow
→
Try this next

Detective K: Secret of the Lost Island
What they share
Both films are directed by Kim Sok-yun, and they both carry the playful mood tag, and they sit in Action / Comedy / Mystery territory. If that's the register that drew you to Detective K: Secret of Virtuous Widow, the second film will land in a comparable space — through a different lens.
playful
What Detective K: Secret of the Lost Island is
Moonlit docks. A girl’s locket snapped shut. Two silver ingots gleam under a lantern, engraved with Joseon marks. A child’s footprint vanishes into the tide. This chase wears inked robes and a detective’s sigh.