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The possibility of hycean worlds, with planet-wide oceans and H<jats:sub>2<\/jats:sub>-rich atmospheres, significantly expands and accelerates the search for habitable environments elsewhere. Recent JWST transmission spectroscopy of the candidate hycean world K2-18 b in the near-infrared led to the first detections of the carbon-bearing molecules CH<jats:sub>4<\/jats:sub> and CO<jats:sub>2<\/jats:sub> in its atmosphere, with a composition consistent with predictions for hycean conditions. The observations also provided a tentative hint of dimethyl sulfide (DMS), a possible biosignature gas, but the inference was of low statistical significance. We report a mid-infrared transmission spectrum of K2-18 b obtained using the JWST MIRI LRS instrument in the \u223c6\u201312 <jats:italic>\u03bc<\/jats:italic>m range. The spectrum shows distinct features and is inconsistent with a featureless spectrum at 3.4<jats:italic>\u03c3<\/jats:italic> significance compared to our canonical model. We find that the spectrum cannot be explained by most molecules predicted for K2-18 b, with the exception of DMS and dimethyl disulfide (DMDS), also a potential biosignature gas. We report new independent evidence for DMS and\/or DMDS in the atmosphere at 3<jats:italic>\u03c3<\/jats:italic> significance, with high abundance (\u227310 ppmv) of at least one of the two molecules. More observations are needed to increase the robustness of the findings and resolve the degeneracy between DMS and DMDS. The results also highlight the need for additional experimental and theoretical work to determine accurate cross sections of important biosignature gases and identify potential abiotic sources. 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