He regret opening the door . Regret trusting his instincts and his bestfriend is a perfect place to get the blame.

Yoongi who seems to doesn't give a about anything and a best of the best ex-policer which jimin bugged him everyday to rejoin the team that he's not interested anymore

or 

yoongi actually does give a about everything and anything and always feels guilty when they had put in the innocent instead of the opposite but does nothing to help them because he can't do about it and he definitely does not want to be found again by anyone,nor by his own crush.

Inspired from drama I Can Hear Your Voice,Acted by jong suk( handsome boy)