Zuko's Scar Dye

Zhao taunts Zuko by stating that fire lord Ozai sees in his son a failure. This is the first mention we get of why Zuko has that scar. Zhao baits him and all Zuko does is says that's not true because if he lets himself believe that, then he has nothing. How heartbreaking is that? He doesn't actually have nothing though because he will always have his uncle no matter what.