Since When did Suzy and Hyeri Become Close Friends?

Korean girl group Girl's Day's Hyeri and singer Suzy's close friendship is garnering many fans' attention.

On October 22, Hyeri uploaded a photo of Suzy with a caption saying, "Suzy I think I took it (the picture) well." 
The photo was taken from 'GRAND MINT FESTIVAL 2017' in Jamsil Olympic Park, Seoul. 

In the picture, Suzy, who was wearing a green outfit at the time, was singing on the stage. 
After Suzy saw her picture on Hyeri's social media account, Suzy wrote "Try harder." 

They are known to be the same age close friends, who are also high school alumni from School of Performing Arts Seoul. 
Currently, Suzy is gaining explosive popularity from her new drama 'While You Were Sleeping' and Hyeri is preparing for the drama 'Two Cops' which is set to go on air on November.

(Credit = Online Community, 'hyeri_0609' Instagram) 

(SBS Star)