騎驢找驢

lit. to search for the mule while riding on it (idiom) / fig. to look for what one already has

(Tw) saddle horse / mounted soldier

to sit astride / to ride (a horse, bike etc) / classifier for saddle horses

donkey / CL:頭|头[tou2]

to try to find / to look for / to call on sb / to find / to seek / to return / to give change