  MnBi$_8$Te$_{13}$ is an intrinsic ferromagnetic (FM) topological insulator
with different complex surface terminations. Resolving the electronic
structures of different termination surfaces and manipulation of the electronic
state are important. Here, by using micrometer spot time- and angle-resolved
photoemission spectroscopy ($\mu$-TrARPES), we resolve the electronic
structures and reveal the ultrafast dynamics upon photoexcitation. Photoinduced
filling of the surface state hybridization gap is observed for the Bi$_2$Te$_3$
quintuple layer directly above MnBi$_2$Te$_4$ accompanied by a nontrivial shift
of the surface state, suggesting light-tunable interlayer interaction.
Relaxation of photoexcited electrons and holes is observed within 1-2 ps. Our
work reveals photoexcitation as a potential control knob for tailoring the
interlayer interaction and surface state of MnBi$_8$Te$_{13}$.
