2020年12月8日是说唱歌手NJ的20岁生日，NJ决定在20岁生日当天发布这首单曲。 这首《从前今天和以后》说是一首歌其实更是一封信，在这封信里问候了10年前和10后的自己。表达出自己仍保持着10年前刚刚接触hiphop音乐的初心和对10年后仍想坚持做音乐的信心。 December 8, 2020 is the 20th birthday of rapper NJ, and NJ decided to release the single on his 20th birthday. This song "Past,today and future" is said to be a song. In fact, it is also a letter, in which I greet myself 10 years ago and 10 years later. He expressed that he still kept the original intention that he had just contacted hip hop music 10 years ago and that he still wanted to stick to music 10 years later.