Chong Won-o, the Democratic Party of Korea's Seoul mayoral candidate, said on the 16th that "shoddy construction was uncovered in the construction of the GTX (Great Train Express)-A Samsung Station section," adding that "Oh Se-hoon must explain."
Kim Hyoung-nam, standing co-chair and Spokesperson of Chong Won-o's election committee, issued a commentary the same day, saying, "The section (where shoddy construction was uncovered) is being built by the Seoul Metropolitan Government under commission from Korea National Railway."
Kim, the Spokesperson, said, "According to the Ministry of Land, Infrastructure and Transport (MOLIT), in the construction of the GTX-A Samsung Station section, it was confirmed that for one work package, only about half the amount of rebar specified in the design was used in all 80 columns that should have been framed," calling it "'boneless construction.'"
He added, "Seoul City was reportedly informed of this by the contractor Hyundai Engineering & Construction in Nov. 2025, but did not report it to the Ministry of Land, Infrastructure and Transport (MOLIT) until Apr. 29, five months later," saying, "There is an obligation to report project progress to the commissioning agency, but it was not done in time." According to Kim, the Spokesperson, in connection with this, MOLIT has launched an audit of the Seoul Metropolitan Government and others.
Kim, the Spokesperson, also said, "The time when the Seoul Metropolitan Government reported the rebar omission to the Ministry of Land, Infrastructure and Transport (MOLIT) was two days after Oh Se-hoon's duties were suspended due to his registration as a preliminary candidate," adding, "Oh must clarify, as mayor at the time, the circumstances under which the city recognized this but failed to report it to the commissioning agency for five months, and what measures the city took."