Daejang–Hongdae Line () is a subway line under construction in South Korea. It will connect Daejang-dong in Bucheon with Hongik University Station in Seoul. First formally proposed in 2014, it passed a financial feasibility study in 2021 and groundbreaking occurred in late 2025. It will be the first subway line in Korea to combine build-transfer-operate (BTO) and build-transfer-lease (BTL) investment models. The government will contribute 1 trillion KRW and Hyundai Engineering and Construction will contribute 1.1 trillion KRW and share revenue.
Several line extension proposals started to undergo evaluation in early 2026.
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