SIOSIJAK Members Profile: SIOSIJAK Facts SIOSIJAK (시오시작 / SIO.SIJAK) is a performance girl group under Good Dream Entertainment. They currently consist of 4 members: Yelim, Sun-A, Hayeon and Eunbee. SIOSIJAK made their music debut on March 12, 2018 with their song called “Lalala”. They are active as a performance group since 2017. According to Hayeon and … Continue reading SIOSIJAK Members Profile