[Korean Patent Attorney National Qualification Examination, Second Stage (변리사 국가자격시험 제2차시험) – Written] X Co. filed a Korean patent application on June 2, 2026 for 'a folding bicycle frame with an integrated locking hub.' The specification describes the frame, the hub-locking mechanism, and a working example. Before the Korean filing, the following events occurred: (1) On March 15, 2025, Y Co. published, in a Korean engineering journal distributed to the public, an article with figures disclosing an identical folding frame with an identical integrated locking hub; (2) On May 20, 2026, Z Inc. filed a Korean patent application for a substantially identical invention, which was published by the Korean Intellectual Property Office after X Co.'s filing date. The examiner rejected X Co.'s claims, and X Co. argues that the March 2025 journal article is not prior art because it was written by a former employee under a confidentiality obligation, and that the Z application cannot be cited at all. Advise X Co. on the prospects of the claims as filed, identifying each issue, stating the governing rule under the Korean Patent Act conservatively, and reaching a reasoned conclusion. If any argument could succeed only on additional facts, state which facts would be needed.