"OK" was described as an "unplugged dance number with rock sounds". In the lyrics, a girl describes how the man she is in love with is her ideal type—perfect and "okay" in every way. The song was written by Crazy Park of the agency Crazy Sound, in collaboration with Shinto and Peter Pan. These songwriters had previously written songs such as "Oppa, You're Mine" and "Oh My God". Choa and Way also took part in the song's production, including concept, costumes, and choreography. "Let Me Know" is a ballad written by Way, who had previously written songs as a member of indie band N.Dolphin, and the lyrics are based on her and Choa's struggle to become singers. At Strawberry Milk's debut press showcase, Way said, "It was my dream to become a singer since I was young. As I was preparing to become a singer, whenever I experienced hardship, I always prayed to let me know if this is the right path for me. The lyrics are about those prayers."
Promotion and music videos
Strawberry Milk performed "Let Me Know" for the first time at the First Chrome Family in Japan Concert on October 4. Their debut showcase was held on October 15 in Cheongdam, Seoul, and their music show debut stage for "OK" was on M! Countdown on October 16. "OK" was promoted through November on all the major music shows, including , where they were nominated for first place. The music video for "OK", released on October 15, was directed by Lee Gi Baek. It received one million views on YouTube in less than five days, and ranked high on China's YinYueTai V Chart. The beginning of the music video depicts Choa and Way transforming into Tetris characters and falling into a pink room. In other scenes of the video they are dressed as strawberries or strawberry milk, with oversized forks or straws on their backs. G.Low of K-Much played the "OK" man in the music video. On October 18, a choreography music video for "OK" was released. This video was filmed at a farm, and the twins danced in front of a strawberry greenhouse.
Reception
Scott Interrante, writing for PopMatters, described "OK" as an "overly saccharine Hi-NRGdance song filled with cute vocals, adorable imagery, and a biting wit." He said "Hello" and "Let Me Know" showcase the twins' "surprisingly impressive vocals", but "OK" lacks a "distinct personality", and regretted that the sub-unit didn't show a different side than they already show with the main group. However, he concluded that the song is "great for what it is" and noted some similarity with J-pop and Orange Caramel's songs.
Track listing
Personnel
These credits were adapted from the album liner notes.
