f(x)'s maknae Krystal celebrated her birthday on 24th October.

Member Luna sent her a birthday message via official Me2day, she said,"Today is our maknae Soojungie-Krystal's birthday,20 minutes left [of the day], wish you have more fun and be happy.I Love you~"

This shows the close relationship among f(x)'s members,Happy Birthday to Krystal once again!

Photo Source: Luna's Me2day