A less-than-perfect debut for the new season of Netflix Inc.’s blockbuster series Squid Game sent shares of related South Korean companies sharply lower Friday.

Artist United Inc., a movie distributor and marketing firm in which Squid Game’s main actor Lee Jung-jae is the largest shareholder, tanked by the daily limit of 30%. Wysiwyg Studios Co., another Artist United investor, plunged as much as 25%, while Dexter Studios Co., a Korean partner of Netflix, sank 24%.