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The observation of $Z_{cs}(3985)$ by BESIII in the $D_s^{*-}D^0$ and$D_s^{-}D^{*0}$ channel adds important dynamic information for a coherentunderstanding of both $Z_c(3900)$ and $Z_c(4020)$, as well as their strangepartners $Z_{cs}(3985)$ and $Z_{cs}(4120)$, on the basis of heavy quark spinsymmetry. With an overall short-ranged contact potential in SU(3) flavorsymmetry we show that the pole structures can be extracted from theexperimental data. Meanwhile, we show the key role played by the $S$-wave openthresholds in $e^+e^-$ annihilations which are correlated with the productionof these $Z$ states in a hadronic molecule picture. Implications of theirscalar heavy quark spin partners $W_{c0,1,2}$ and $W_{cs0,1,2}$ are alsogained.

The nature of charged charmonium-like states $Z_c(3900)$ and its strange partner $Z_{cs}(3982)$