yes of course they are his songs even if he just write the lyrics they are still his songs, but for one fine day 's album he write , composed and produced all the songs except in 27 years in wich peter malick was the producer and energy where the producer was verbal jint so those songs are his style, he said that in this album made the songs that he always wanted to try but couldnt because its not cnblue' s style , so for sure those songs are yonghwa's style(sorry for my english