SEE ALSO: Amber shows her support for fellow f(x) member Krystal on set of 'My Lovely Girl'

Rain�and�f(x)'s�Krystal�couldn't stop smiling as Krystal rested her head on Rain's shoulder for their romantic poster shoot. The set was also full of laughter when�Rain had trouble unwrapping a lollipop for INFINITE's�L,�and then ended up dropping it. Krystal also couldn't hold back the laughs when she was around her handsome co-stars, showing her cheerful and cute charms that contrast with her chic image.

Get ready for the finale this Thursday!