'K-POP Idol Members Who Use Stage Names Which Seem Like Real Names' has been on the web and becoming an issue!

Internet users who have read and seen these photos responded like 'Yeri was not her real name? I didn't know!',
'So in Red Velvet, Seol-Gi is the only one who uses real name?',
'It's surprising that Sandeul and Yesung's real names are so common',
'Hyorin seems like exactly Hyo-Rin but it's not her real name? lol' etc.