Analyzing the Sustained Vocal Placement Required for "The Road to Me"

It is fascinating to observe how Sung Si-kyung maintains his signature warm, resonant baritone across several decades of performance. Specifically, in tracks like "The Road to Me" (2001) and even the more recent "And We Go" (2021), the breath control required for the sustained high notes in the chorus is remarkably consistent. I'd argue that the technical demands of his signature ballad repertoire are often underestimated; the phrasing requires an almost operatic level of diaphragm support, yet he delivers it with intimate pop sensibility. Are there any specific live versions where you feel his technique peaks, or perhaps a lesser-known track that truly showcases his range complexity?