My Secret, Terrius — Ending Explained

The central mysteries resolve through several major revelations:

• Cha Jung-il's Murder: Go Ae-rin’s husband was not killed by random cardiac arrest; he was an accidental eyewitness to the assassination of the Chief of National Security, murdered by Cornerstone's hitman, K.
• J-International's True Nature: The company was a covert front laundering operations for "Cornerstone," an international syndicate profiting from bio-chemical warfare contracts in South Korea.
• The NIS Mole: While Deputy Director Kwon Yeong-sil was initially suspected, the true high-level traitor feeding intelligence to Cornerstone was revealed to be NIS Director Shim Woo-cheol.
• Jin Yong-tae's Survival: After cooperating with Bon in a sting operation and taking a gunshot wound, Yong-tae survives and is placed under witness protection, peacefully running a small cafe.
• The Finale: Shim Woo-cheol is arrested, Cornerstone's South Korean network is dismantled, and Bon settles his past in Warsaw and New York. The series concludes with Bon and Ae-rin reuniting in Seoul as official NIS field partners code-named "Terrius" and "Alice."

Critical readings of the series include:

• The Domestic Satire Reading: Viewed as a lighthearted satire of intelligence agencies, suggesting that attentive stay-at-home parents equipped with group chats are fundamentally more observant and formidable than multi-million-dollar state surveillance networks.
• The Therapeutic Healing Narrative: Interprets the spy conspiracy as secondary to Kim Bon’s psychological rehabilitation, tracking his journey from post-traumatic isolation back into emotional vulnerability and domestic belonging.
• The Non-Traditional Partnership Reading: Highlights the deliberate choice to forgo an overt romantic conclusion in favor of mutual trust, shared purpose, and professional equality, respecting Ae-rin’s autonomy and recent grief.