方知

方知	fāng zhī	to realize only then
方	Fāng	surname Fang
方	fāng	square / power or involution (math.) / upright / honest / fair and square / direction / side / party (to a contract, dispute etc) / place / method / prescription (medicine) / just when / only or just / classifier for square things / abbr. for square or cubic meter
知	zhī	to know / to be aware