Earlier today we heard the teaser for 2AM's track To Her (????) which features 2PM's Chansung. 2AM's official youtube page updated a teaser video showing 2AM and Chansung together in the studio. When Chansung was asked to do the rap part out loud, 2AM's Changmin jokingly calls Taecyeon and says we need your help for the rap part. Check out the brotherly love between the two groups below.