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There is a very unique section on Line 4. It is the Gwabaegi Cave between Namtaeryeong and Seonbawi. Let's take a look at why this section was created and what kind of confusion there was on Line 4 right after the opening of the Gwacheon Line. ????BGM Song: MusicbyAden - Forever Music provided by Vlog No Copyright Music. Creative Commons - Attribution-ShareAlike - CC BY-SA Video Link: • MusicbyAden - Forever (Vlog No Copyri... ????References 30 Years of Seoul Subway Construction History, Gwacheon Line Double-Track Electric Railway Construction Site #AnsanLine #GwacheonLine #Line4