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In this work, we study the end-of-the-world (EOW) branes anchored to theboundaries of BCFT${}_2$ dual to the BTZ black hole. First, we explore thethermodynamics of the boundary system consisting of the conformal boundary andtwo EOW branes. This thermodynamics is extended by the tension appearing as theeffective cosmological constant of JT black holes on the EOW branes. Thetension contribution is identified with the shadow entropy equivalent to theboundary entropy of the BCFT${}_2$. The thermodynamics of the JT black holesand the bulk of BCFT${}_2$ can be combined into a novel grafted thermodynamicsbased on the first law. Second, we focus on the observer's view of the EOWbranes by lowering the temperature. We show that the EOW branes generate ascale called ``reefs" inside the horizon. This scale also appears in thegrafted thermodynamics. At high temperatures, observers on the EOW branes seetheir respective event horizons. The reef starts to grow relatively to thehorizon size at the temperature, $T_{grow}$. As the temperature cools down thereef area fills the entire interior of the JT black holes at the temperature$T_{out}$. Then, the observers recognize their horizons disappear and see thelarge density of the energy flux. At this temperature, the two JT regionsbecome causally connected. This connected spacetime has two asymptotic $AdS_2$boundaries with a conformal matter. Also, we comment on the graftedthermodynamics to higher dimensions in Appendix B.

End of the World Perspective to BCFT