A neighbor who secretly operates as an undercover journalist. He stages the apartment noise scandal to investigate construction fraud, using Woo-sung as a scapegoat. He maintains extensive surveillance and dossiers on all residents. After his investigation fails, he wounds himself to confront Eun-hwa, ultimately failing to secure the incriminating ledger as Woo-sung destroys the evidence.
Fellow resident who becomes an uneasy ally in uncovering the conspiracy.
Journalist using the building's residents as pawns to expose the representative.
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