The discrete-time quantum walk provides a versatile platform for exploring abundant topological phenomena due to its intrinsic spin-orbit coupling. In this work. we study the non-Hermitian second-order topology in a two-dimensional non-unitary coinless discrete-time quantum walk. which is realizable in the three-dimensional photonic waveguides. https://www.marcelovicente.com/product-category/undone-texture-hairspray/