let him who tied the bell on the tiger take it off—whoever started the trouble should end it
解鈴還需系鈴人jiě línɡ hái xū jì línɡ rén
比喻誰(shuí)出了問(wèn)題，還得由誰(shuí)自己去解決。Whoever started the trouble should end it. let the mischiefmaker undo the mischief, it is better for the doer to undo what he has done, To untie the bell, the person who tied it is necessary.