The title song "Psycho" is a "cool" and "sweet" love song that tells the story of a lover who admits that they are only each other even if they look like "Psycho" to others.
SM Entertainment, a subsidiary company, said, "The music video that is released together has a three-dimensional and sensual image of the new song and the visual of RED Velvet."
Four new songs were added to the existing songs. The medium pop dance 'In & Out' expressing the thrilling psychology of falling into an irresistible and fascinating opponent, the pop ballad 'Remember Forever' reminiscing about the dreamy 'The Reeves festival', and the special track 'La Rouge' presented at the third solo concert.
This album has attracted a variety of musicians from home and abroad, including world-renowned composer Andreas Oberg, famous production team Moon Shine and Royal Dive, hit makers Yoo Young-jin and Kenji.