  In this work, we systematically investigate the heavy-strange meson systems,
$D^{(*)}K^{(*)}/\bar{B}^{(*)}K^{(*)}$ and
$\bar{D}^{(*)}K^{(*)}/B^{(*)}K^{(*)}$, to study possible molecules in a
quasipotenial Bethe-Salpter equation approach together with the one-boson
exchange model. The potential is achieved with the help of the hidden-gauge
Lagrangians. Molecular states are found from all six $S$-wave isoscalar
interactions of $D^{(*)}K^{(*)}$ or $\bar{B}^{(*)}K^{(*)}$. The charmed-strange
mesons $D^*_{s0}(2317)$ and $D_{s1}(2460)$ can be related to the ${D}K$ and
$D^*K$ states with spin parities $0^+$ and $1^+$, respectively. In the current
model, the $\bar{B}K^*$ molecular state with $1^+$ is the best candidate of the
recent observed $B_{sJ}(6158)$. Four molecular states are produced from the
interactions of $\bar{D}^{(*)}K^{(*)}$ or $B^{(*)}K^{(*)}$. The relation
between the $\bar{D}^*{K}^*$ molecular state with $0^+$ and the $X_0(2900)$ is
also discussed. No isovector molecular states are found from the interactions
considered. The current results are helpful to understand the internal
structure of $D^*_{s0}(2317)$, $D_{s1}(2460)$, $X_0(2900)$, and new $B_{sJ}$
states. The experimental research for more heavy-strange meson molecules is
suggested.
