© 2018 American Physical Society. In order to study the correlations between clusters and nucleons in light nuclei, we formulate a new superposed Tohsaki-Horiuchi-Schuck-Röpke (THSR) wave function which describes both spatially large spreading and cluster-correlated dynamics of valence nucleons. Using this new THSR wave function, the binding energy of B9 is significantly improved in comparison with our previous studies. We calculate the excited states of B9 and obtain an energy spectrum of B9 which is consistent with the experimental results. This includes the prediction of the first 1/2+ excited state of B9 which is not yet fixed experimentally. We study the proton dynamics in B9 and find that the cluster-proton correlation plays an essential role for the proton dynamics in the ground state of B9. Furthermore, we discuss the density distribution of the valence proton with special attention to its tail structure. Finally, the resonance nature of excited states of B9 is illustrated comparing root-mean-square radii between the ground and excited states.