Cao Lu revealed that she wasn't always the bright and cheery girl we see nowadays on variety shows!

On the March 16 broadcast of SBS powerFM's 'Kim Chang Ryul's Old School,' member Linzy revealed she had gone to school with Cao Lu and other stars.

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After this, DJ Kim Chang Ryul asked Cao Lu, "What were you like in college?" and she replied, "Linzy already knows this, but I did not always have such a bright personality.  I changed bit by bit as time passed.  I was always alone when I was going to school.  I was the type to disappear after a class ended.  That's why I often lost the chance to get close to my classmates, which was a shame."

Now's your chance!  Find your celebrity classmates in the business to hang out with.