There are many trio such as guitar/base/drums, but guitar/drum duo are not common. Guitarist Kim Ji-seok and drummer Jung Da-hoon, who met as college students at the DIMA in Korea, have been in session and band activities since their freshman year of college. Currently, he took a break from band activities and turned to duo activities. Based on acoustic and electronic. In Korean, it is 'aftereffect'. The coronavirus that has rocked our daily lives for the past two years has caused a lot of damage I put it into the song based on the foundation. The delay sound of the guitar expresses us who have the aftereffects, The rhythm of the drum is when various symptoms appear, The modulation of the synth and the sound of the mugh base are the aftereffects It is expressed by referring to the situation that cannot escape from the vicious cycle.