DK and Seungkwan of Seventeen shared their thoughts on “Serenade,” their first EP together, via their agency Pledis Entertainment. The EP, released Monday, comprises six ballads about the emotions accumulated through love. The lead track “Blue,” DK believes, suits the cold weather and is also the right song to highlight the pair’s voices. “We went to great lengths recording ‘Blue,’” he elaborates, taking pains to convey feelings and to perfect harmony, which makes the track all the more dear to