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Motivated by the first observation of the double-charm tetraquark$T_{cc}^+(3875)$ by the LHCb Collaboration, we investigate the nature of$T_{cc}^+$ as an isoscalar $DD^*$ hadronic molecule in a meson-exchangepotential model incorporated by the coupled-channel effects and three-bodyunitarity. The $D^0D^0\pi^+$ invariant mass spectrum can be well-described andthe $T_{cc}^+$ pole structure can be precisely extracted. Under the hypothesisthat the interactions between the heavy flavor hadrons can be saturated by thelight meson-exchange potentials, the near-threshold dynamics of $T_{cc}^+$ canshed light on the binding of its heavy-quark spin symmetry (HQSS) partner$D^*D^*$ ($I=0$) and on the nature of other heavy hadronic molecule candidatessuch as $X(3872)$ and $Z_c(3900)$ in the charmed-anticharmed systems. Thelatter states can be related to $T_{cc}^+$ in the meson-exchange potentialmodel with limited assumptions based on the SU(3) flavor symmetry relations.The combined analysis, on the one hand, indicates the HQSS breaking effectsamong those HQSS partners, and on the other hand, highlights the role played bythe short and long-distance dynamics for the near threshold $D^{(*)}D^{(*)}$and $D\bar{D}^{(*)}+c.c.$ systems.

Coupled-channel description of charmed heavy hadronic molecules within the meson-exchange model and its implication