Zhè jiàn shì jiù xiàng dǎkāi le Pānduōlā móhé yīyàng.
This matter is like opening Pandora's box.
Tips
culture
潘多拉魔盒 (Pandora's box) is widely used in Chinese as a metaphor for unleashing unforeseen troubles, just as in English. Also the name of the Pandora jewelry brand.