Girl group f(x) member Sulli and her look-alike SHINee Taemin is becoming a hot issue.

On July 31, Sulli posted on her me2day, "Short hair for summer! Would you like to cut your hair with me too? Please support Goo Jae Hee's character in SBS drama 'To the Beautiful You', airing on the 6th! This is a behind cut from 'VOGUE Girl' photo shoot from last time" along with a picture.

In the picture, Sulli can be seen with a shortcut hair style, showing off a boyish charm unlike her cute side she usually appeals. The shortcut accentuated Sulli's sharp nose and pale skin, and it made her look a lot like SHINee's Taemin.

Internet users who saw this commented, "How could she pull off shortcut, Sulli's the best" and "Are they secretly siblings?"

Photo Credit: Online Community