  Let $(M,\omega_M)$ be a six dimensional closed monotone symplectic manifold
admitting an effective semifree Hamiltonian $S^1$-action. We show that
$(M,\omega_M)$ is $S^1$-equivariant symplectomorphic to some K\"{a}hler Fano
manifold $(X,\omega_X, J)$ with a certain holomorphic $\mathbb{C}^*$-action. We
also give a complete list of all such Fano manifolds and describe all semifree
$\mathbb{C}^*$-actions on them specifically.
