Deep learning has been widely applied across many areas of experimental high-energy physics, yet existing models address only event-level classification or object tagging and therefore still require reconstruction algorithms tailored to each decay channel. We present the first application of segmentation to resonance tagging at BESIII and introduce ResoSeg, a deep learning model that jointly performs particle-level segmentation and event-level classification, enabling a one-pass analysis of resonance to anything decays while precisely reconstructing the relevant resonance properties. We demonstrate the reconstruction of $η_c$ with $e^+e^-\toπ^+π^-h_c$, $h_c\toγη_c$, $η_c\to\text{anything}$. The model is trained on BESIII-$η_c$ dataset, which is constructed with per-track true labels obtained via a Truth-Matching Algorithm. Experimental results show that the average combined efficiency of ResoSeg is more than double that of the conventional 16-channel approach across energy points from 4.19 to 4.60\,GeV. The model generalizes to unseen energy points, adapts to other $η_c$ production modes through transfer learning, and remains robust against variations in the $η_c$ mass, width, and branching fractions, providing a general, resonance-aware model applicable beyond $η_c$ and BESIII. The source code is available at https://github.com/oashen/ResoSeg.

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