Efficient through-wall wireless transmission is vital in modern wireless communications systems. Development of the 5th generation wireless systems (5G) provides faster and broader wireless connectivities. Despite this, seamless connections remain challenging in densely built cities. The daily used Wi-Fi signals face significant reflection when passing through walls. To address this issue, we proposed a tunable cascaded metasurface design concept that enables near-reflectionless through-wall wireless transmission with dynamic frequency selection. The cascaded metasurface designed with bianisotropic electromagnetic wave responses provides excellent air-wall impedance matching, solving the reflection problem in fundamentals. Meanwhile, the multilayer cascading structures allow for flexible tuning of the interlayer spacing, leading to dynamic frequency selection and expanded communication capacity. This reconfigurable cascaded metasurface design optimizes the through-wall wireless communication channels, hence, possesses a high potential to assist future 5G and 6G ubiquitous wireless connectivity.