f(x)

02. f(x) - Jet

05. f(x) - Love Hate

f(x) electric shock remix

f(x) - Beautiful Stranger (by Amber+Luna+Krystal)

Butterfly- Ost to the beautiful you- jessica and krystal

좋았던 건, 아팠던 건 (When I Was, When U Were) - Chen Kim and Krystal Jung

Say Yes - Jessica Jung ft. Krystal Jung