jiě​líng​hái​shì​xì​líng​rén

the one who caused the problem should solve it

Senses

解铃还是系铃人/ 解鈴還是繫鈴人 jiě​líng​hái​shì​xì​líng​rén the one who caused the problem should solve it

Whoever started the trouble should be the one to end it; literally "to untie the bell, you still need the person who tied the bell"

References

see 解铃还是系铃人/解鈴還是繫鈴人 系铃解铃/繫鈴解鈴
see 心药/心藥 解铃还是系铃人/解鈴還是繫鈴人