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Since a while back, fans have have pointed out the similarities between D.O. (left photo) and the mysterious man (right photo) seen above. The man was said to be wearing similar shorts and shoes that D.O. had been spotted wearing previously. In addition, fans also linked the two by spotting some matching 'couple items', including the same sneakers and rings. They also pointed out that a few days after Sojin sang John Legend's "All of Me" at Girl's Day's concert, D.O. also chose "All of Me" as his favorite song. In addition, Sojin also previously mentioned that her first love lives in Gwangjingu, which is also where EXO's dorm was said to be located.

Girl's Day's stylist also recently shared on her Instagram a photo of Sojin and pointed out she looked like Wendy from Peter Pan. Then, a netizen, whom fans speculate knows Sojin in real life, had commented, "You are Wendy, prettier than Cinderella," which is the line that D.O. sings in EXO-K's "Peter Pan".

All these speculations were passed around by fans last year, but recently a nail art photo from last March has once again gained spotlight and sparked renewed interest. Last year, Sojin was spotted at '2014 F/W Seoul Fashion Week' with nail art by Sense Hong. The nail artist also showed off the same nail-art design that Sojin had through her Instagram, and recently fans began to take a closer look to see the  'I<3DO' on one of the nails. 

With this photo coming back to light, EXO fans have been leaving harsh comments on Sojin's Instagram, mentioning things like her age and that she is too old to be with D.O, or warning her not to become the next Taeyeon-Baekhyun. Girl's Day's fans fought back, leading to quite a bit of arguments going on on her Instagram page. It is speculated that this is what caused Sojin to private her Instagram. 

What do you make of these old rumors and the reaction from fans?