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Recently, for the first time, the BESIII Collaboration reported the strangehidden charm tetraquark states $Z_{cs}(3985)^-$ in the $K^+$ recoil-massspectrum near the $D_{s}^{-}D^{*0}/ D_{s}^{*-}D^{0}$ mass thresholds in theprocesses of $e^{+}e^{-}\to K^{+}(D_{s}^{-}D^{*0}+D_{s}^{*-}D^{0})$ at$\sqrt{s}=4.681$ GeV. The significance was estimated to be 5.3 $\sigma$. Weshow that the newly observed $Z_{cs}(3985)^-$ state is the $U$-spin partner of$Z_c(3900)^{-}$ as a resonance within coupled-channel calculation in the$\text{SU(3)}_F$ symmetry and heavy quark spin symmetry (HQSS). In the$\text{SU(3)}_F$ symmetry, we introduce the $G_{U/V}$ parity to construct theflavor wave functions of the $Z_{cs}$ states. In a unified framework, weconsider the $J/\psi\pi(K)$, $\bar{D}_{(s)}{D}^*/\bar{D}_{(s)}^*{D}$coupled-channel effect with the contact interaction. With the masses and widthsof $Z_c(3900)$ and $Z_c(4020)$, we determine all the unknown couplingconstants. We obtain mass and width of $Z_{cs}(3985)$ in good agreement withthe experimental results, which strongly supports the $Z_{cs}$ states as the$U/V$-spin partner states of the charged $Z_c(3900)$. We also calculate theratio of the partial decay widths of $Z_{cs}(3985)$, which implies that the$\bar{D}_sD^*/\bar{D}^*_s D$ decay modes are dominant. We also predict the$Z_{cs}^\prime$ states with a mass around $4130$ MeV and width around $30$ MeV,which are the $U/V$-spin partner states of the charged $Z_c(4020)$ and HQSSpartner states of the $Z_{cs}(3985)$. In the hidden bottom sector, we predictthe strange tetraquark states $Z_{bs}$ and $Z_{bs}^\prime$ with a mass around10700 MeV and 10750 MeV, which are the $U/V$-spin partner states of$Z_{b}(10610)^{\pm}$ and $Z_b(10650)^{\pm}$, respectively.

$Z_{cs}(3985)^-$ as the $U$-spin partner of $Z_c(3900)^-$ and implication of other states in the $\text{SU(3)}_F$ symmetry and heavy quark symmetry