Rookie idol APL built up their skills in a variety of activities from winning debut (eyipeul) threw Chu Shi Biao of the music industry. Meaning of APL (eyipeul) is always hard, short for A plus contains a willingness to let them know the score of A + grades peak. Members Seo, teen, my Eno, leather, four-member group of APL (eyipeul) consisting of the album was a severe one-year preparation course, had a lot of time, effort and enthusiasm botaeneun work.

Seo is the main vocalist and leader captivates many yeosim in style with a clean, pure white appearance of the scion were skin and combines the skills of a trainee dabujin life since high school.
Of the sub-vocal interest Tin wrapper, and many of the award-winning dance competitions since high school, rap voice is intense, vocal voice gives a reverse appeal to those who hear it have a soft voice.