Nam Woo-hyun, the vocalist of boy band INFINITE, could easily have marked his 10th year as a soloist by returning to the ballads that launched his solo career. Instead, the title track of his new album casts him as a devil, a character he traces back to the hardest stretch of his life. “2X8,” his second full-length album, drops Wednesday, and its title fits several milestones into three characters. Two plus eight makes 10, for his years as a soloist. Two times eight makes 16, matching both the number of tracks and the years since INFINITE debuted in 2010, and the two numbers together form his birthday, Feb. 8. Nam co-wrote the lyrics and music for every track on the album, which took about a year to complete and moves from an orchestral intro through pop rock and R&B before closing on a ballad. “The tracks span a lot of genres, and they’re the result of 10 years of making music,” Nam said in an interview with The Korea Times at a cafe in Gangnam District, Seoul, Tuesday. “This album gathers everything from the past decade in one place.” Nam debuted in 2010 as the main vocal