Knetz throwback about f(x) Krystal last stage as an idol and her amazing visual.

I really like that dayㅠㅠㅠㅠ

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 Netizens comments :

- It's really ㅠㅠㅠㅠ pretty ㅠㅠThat day, the real atmosphere was so pure and innocent ㅠㅠ

- What day is this?? 

- This is SM concert. 

- I miss Jung Soojung on stage. 

- Pretty. 

- It's so pretty. I want to see Krystal perform. ㅠㅠ 

- Please release a solo song ㅠㅠ

- I miss singer Soojung

- Ha... Pretty. 

- Ah this day is really pretty.