 LOS ANGELES--BUSINESS WIRE--- SY CLASSACTION--Glancy Prongay Murray LLP GPM, a leading national shareholder rights law firm, today announced that it has commenced an investigation on behalf of So-Young International Inc. So-Young or the Company NASDAQ: SY investors concerning the Companys possible violations of the federal securities laws. If you suffered a loss on your So-Young investments or would like to inquire about potentially pursuing claims to recover your loss under the federal secu 