She recently had a chat through the 'V' app with her fans. During the chat, she said, "You guys can talk about your 1st or 2nd bias. Of course you have someone you like. But to my face, shouldn't you say I'm your favorite?" She added, "You shouldn't tell me that you only support 7 members."
It seems despite the possibility that some fans showed partiality toward her by openly admitting that they supported the other 7 Lovelyz members but not her, she chose to respond to the matter in a joking/sarcastic manner.
Did you catch Seo Ji Soo during the recent chat?