Patrick Frater Asia Bureau Chief“Broker,” the unconventional family drama which appeared in competition at last month’s Cannes Film Festival, topped the box office in South Korea on Wednesday, its opening day.“Broker” grossed $1.10 million, enough to depose crime actioner “The Roundup” from the top spot that it had enjoyed for the past three weeks and which had made it the highest performing film this year.According to data from the Kobis tracking service operated by the Korean Film Council, “Broker” played on 1,590 screens and sold 145,000 tickets for Wednesday screenings. Its cumulative total of $1.15 million includes some $44,000 of previews earned on 14 screens.The feat by a local art-house film gives further support to the notion that cinema attendance is rebounding in Korea.