I Love SEVENTEEN 
A cold heart is my protection mechanism. I don't really feel anything for anyone.     
I shut myself off to make life bearable. I'm like a damn machine sometimes. Unfeeling. Uncaring. Emotionless.   
 Being heartless also prevents heartbreaks. There is no shame in being heartless. Rather it is being practical when your heart wants you to act stupid. It is good to be heartless.