  $P_c(4457)$ has been discovered over five years, but the parity of this
particle remains undetermined. In this letter we propose a new interpretation
for $P_c(4457)$, which is the state generated from the coupled-channel
$\bar{D}^0\Lambda_c^{+}(2595)$ and $\pi^0 P_c(4312)$ since they can exchange an
almost on-shell $\Sigma_c^+$. In this scenario, the parity of $P_c(4457)$ will
be positive, which is different from the candidate of the bound state of
$\bar{D}^*\Sigma_c$. The main decay channel of $P_c(4457)$ in this model is
$P_c(4312)\pi$. We propose three processes $\Lambda_b^0 \to J/\psi K_s p
\pi^-$, $\Lambda_b^0 \to J/\psi K^- p \pi^0$, and $\Lambda_b^0 \to J/\psi p
\pi^- \pi^+ K^-$ to verify $P_c(4457)\to P_c(4312)\pi$.
