American singer-songwriter Billie Eilish wrapped up her one-day concert at Gocheok Sky Dome in Guro District, western Seoul, on Monday evening. It was Eilish's first concert in Seoul in four years. "Hyundai Card Super Concert 26 Billie Eilish" was part of Eilish's world tour to promote her second full-length album, “Happier Than Ever,” which was released last year. Local celebrities such as Hoyeon (or Jung Ho-yeon), Lee Dong-hwi, Ryu Jun-yeol, Hyeri, Yeonjun and Beomgyu of boy band Tomorrow X Together and J-Hope and RM of BTS were spotted in the audience of the pop star's concert. [YONHAP]