"The Secret of the Grand Mansion: The Missing Girls" features ten members of WJSN - Seola, EXY, Bona, Soobin, Luda, Dawon, Eunseo, Yeoreum, Dayoung, and Yeonjung - seen drifting on an empty planet after an inexplicable horror derailed their travel to an awards ceremony. With the girls finding the Gr ...