Yellow Flower is an extended play by MAMAMOO. It is the first EP of the Four Seasons, Four Colors project, and Yellow Flower is Hwasa's EP. The EP features the previously released single Paint Me. Starry Night is the title track of Yellow Flower.
The album is supposed to represent spring, but has flowers as the cover art to reference Hwasa (the yellow background is to represent Hwasa's color in the Four Seasons, Four Colors project, which is yellow).
From Winter to Spring is an audio of MAMAMOO singing Star Wind Flower Sun's chorus. In Star Wind Flower Sun's MV, a clip of what happened in the audio was shown.