  The newly observed $\Xi(1620)^0$ by the Belle Collaboration inspires our
interest in performing a systematic study on the interaction of an anti-strange
meson $(\bar{K}^{(*)})$ with a strange or doubly strange ground octet baryon
$\mathcal{B}$ ($\Lambda$, $\Sigma$, and $\Xi$), where the spin-orbit force and
the recoil correction are considered in the adopted one-boson-exchange model.
Our results indicate that $\Xi(1620)^0$ can be explained as a $\bar{K}\Lambda$
molecular state with $I(J^P)=1/2(1/2^-)$ and the intermediate force from
$\sigma$ exchange plays an important role. Additionally, we also predict
several other possible molecular candidates, i.e., the $\bar{K}\Sigma$
molecular state with $I(J^P)=1/2(1/2^-)$ and the triply strange $\bar{K}\Xi$
molecular state with $I(J^P)=0(1/2^-)$.
