  Inspired by the recent findings of $Z_{cs}$ and $P_{cs}$ states, we
investigate the strong interactions of the systems with open strangeness(es)
from the light sector to the heavy sector (no beauty quark), where the
interaction potential is derived from the vector meson exchange mechanism in
$t$- and $u$-channels. In the current work, we discuss all of single channel
cases for the open strangeness in the systemic framework, where the resonances
$X_0(2866)$, $D^*_{s0}(2317)$ and $D_{s1}(2460)$ are dynamically generated.
Furthermore, there are many new exotics predicted. In addition, the left-hand
cut problem in $t$- and $u$-channels is discussed in detail.
