PSY (37, née Park Jae Sang) and Rain (32, née Jung Ji Hoon) are the two Korean singers with the honorary title of world star, putting their names on TIME's Person of the Year and Billboard's Hot 100, and, for PSY, having the most viewed video on YouTube for his song, Gangnam Style.

This honorary position, however, comes with its own agony. Rain is currently suffering from the issues on serving in the military, which has already been addressed once, and PSY suffered from the provocative sequel to 'Gangnam Style,' 'Gentleman.' While some are even looking at PSY's influence as a religious one, the comeback of the two world stars this year is a hot issue.

PSY in a national concert which was held on December 22, 2013, shared his agony. He said "I was anxious and stressed out when the sequel of 'Gangnam Style,' 'Gentleman' was coming out because the track was being introduced in so many different countries," and added, "'Gentleman' was a song that wasn't me."

Rain, on the other hand, said in an interview regarding the military scandal, "I tend to seek silence when a problem occurs and wait until everything clears out," and added, "I tried to prepare (for the new album) harder than for my debut album."

Rain experimented with different musical styles, reminiscing his passionate debut periods. PSY also concentrated on the music that he does the best. The solution may seem similar, but the method was not. PSY has been increasing the expectation of his comeback, collaborating with artists such as Snoop Dogg and Steven Tyler. He said at the concert on December 22, 2013, "I am looking back to the beginning of my career and preparing a song of my style. If I get lucky, the song will be a hit (like 'Gangnam Style'). This line of thinking makes me feel at ease."

Rain, on the other hand, focused on experimental, various genres that he has never tried before. "La Song," one of the double title tracks of the sixth album 'Rain Effect,' which was released on January 2, is comprised of hip-hop, old school, electronic, rock, and punk. Other tracks are to include genres such as Latin, pop, swing, traditional Korea, and orchestra.