Japan's J-League is just four games into a new season, but already the behaviour of its players is hitting the headlines for the wrong reasons after a player appeared to stamp on an opponent's face. Videos of the South Korean defender Kim Min Hyeok, who plays for Sagan Tosu, have gone viral after he allegedly brutally stamped on the face of opponent Mu Kanazaki. Sagan are ninth in the J-League and furious claims have been made that the 23-year-old deliberately committed the horrific foul after being jostled by 11th-placed Kashima Antlers player Kanazaki. Kim Min Hyeok (left) and Mu Kanazaki (right) fight it out for the ball on the wing during a J-League clash . After Kanazaki went down, it is alleged that Hyeok stamped down on the face of his fallen opponent . Despite the vicious looking nature of Hyeok’s apparent attack and Kanazaki’s dramatic clutch to his face, the defender only received a yellow card and was allowed to play on, much to the fans' uproar. Whether or not the foul was intentional, it is suspected that the reason for Japanese  fans’ outcry is not so much the act itself, but the fact that it was committed by a South Korean player. Hyeok's boot appears to scrape down Kanazaki's face, but the man on the floor came out as the winner later . Hyeok was somehow only shown a yellow card for the challenge that infuriated fans at the stadium . Some Japanese fans have demanded not only the expulsion of Hyeok, but of all South Koreans, from the game. However, regardless of the controversy, justice - to some extent - was served when the supposed stamped-on player’s team won 3-1, with Kanazaki among the goals.
Kim Min Hyeok has been accused of stamping on an opponent's face . Video footage appears to show Hyeok's foot scraping Mu Kanazaki's face . Kanazaki was among the goals in a 3-1 win for his Kashima Antlers side .