Sojin was a guest on the April 11 broadcast of KBS 2TV's '1 vs. 100' where announcer Jo Choong Hyun asked the idol singer, "I hear the members of Girl's Day have a complaint about you?"
Sojin then replied, "I don't usually tend to gain much weight." She went on, "The members have to skip meals leading up to the comeback but I would continue to eat a lot."
Sojin explained, "It looked like I had muscles for a while, but it didn't last long."
When asked about her waist size and weight, the singer commented, "My weight is always consistent at 49-50 kilograms (108 - 110 pounds). The maximum waist size was around 22-inches," causing the audience to gasp.