EXO is an famous kpop group, they have to take care of two kid. They expected little kids but no. 

They are responsible for taking care of their manager's brother's kids Im Yun Sun and Im  Mi Sun, who are 20 & 21. 

They both don't act their age, they act like 3&4 year olds. 

How will exo take care of Mi Sun and Yun Sun?