Daily Chinese Idiom Guessing Game
Someone or something has disappeared and its whereabouts are unknown.
向方向。不知道哪里去了。
明·冯梦龙《东周列国志》第一回宣王问曰‘如今红衣小儿何在？’答曰‘自教歌之后，不知去向。’”
After the party, my keys were gone, and I had no idea where they went.