"Pink Romance" is the first collaboration single of labelmates K.Will, Sistar, and Boyfriend from Starship Entertainment released under the name 'Starship Planet'.

[1] The special digital single was released on November 25, 2011.

K.Will, Sistar, and Boyfriend collaborated as 'Starship Planet' on a festive music video for the digital single "Pink Romance" in which they expressed their love for each other and their fans.

[2] A part of the digital single's sales will be donated to charity.

[3] Starship Entertainment also remarked that their artists have volunteered to contribute to the community.