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[Abridged] The X-ray broadband spectra of the bare AGN Mrk 110, obtained bysimultaneous XMM-Newton and NuSTAR observations (Nov 2019 and April 2020), arecharacterised by the presence of a prominent and absorption-free smooth softX-ray excess, moderately broad OVII and Fe Kalpha emission lines, and a lack ofa strong Compton hump. While relativistic reflection as the sole emission isruled out, a simplified combination of soft and hard Comptonisation from a warmand a hot coronae, plus mild relativistic disc reflection reproduces the datavery well. We aim to confirm the physical origin of the soft X-ray excess ofMrk 110 and to determine its disc-corona system properties from its energeticsusing two new sophisticated models: reXcor and relagn, respectively. At bothepochs, the inferred high-values of the warm-corona heating from the X-raybroadband spectral analysis using reXcor confirm that the soft X-ray excessoriginates mainly from a warm corona rather than relativistic reflection. Theintrinsic best-fit SED determined at both epochs using relagn show a high X-raycontribution relative to the UV and are very well reproduced by a warm and hotcoronae plus mild relativistic reflection. The outer radii of the hot and warmcoronae are located at a few 10s and ~100 Rg, respectively. Moreover, combiningthe inferred low Eddington ratio (~ a few %) from this work, and previousmulti-wavelength spectral and timing studies suggests that Mrk 110 could beclassified as a moderate changing-state AGN. Our analysis confirms theexistence of a warm corona as a significant contribution to the soft X-rayexcess and UV emission in Mrk 110, adding to growing evidence that AGNaccretion deviates from standard disc theory. This strengthens the importanceof long-term multi-wavelength monitoring on both single targets and large AGNsurveys to reveal the real nature of disc-corona system in AGN.

Probing the face-on disc-corona system of the bare AGN Mrk 110 from UV to hard X-rays: a moderate changing-state AGN?