Laws of Badminton - International Version
17. OFFICIALS AND APPEALS
17.1 The Referee shall be in overall charge of the tournament or event of which a match forms part.
17.2 The umpire, where appointed, shall be in charge of the match, the court and its immediate surrounds. The umpire shall report to the Referee.
17.3 The service judge shall call service faults made by the server should they occur (Law 9.1).
17.4 A line judge shall indicate whether a shuttle landed ‘in’ or ‘out’ on the line(s) assigned.
17.5 An official’s decision shall be final on all points of fact for which that official is responsible except that if, in the opinion of the umpire, it is beyond reasonable doubt that a line judge has clearly made a wrong call, the umpire shall overrule the decision of the line judge.
17.6 An umpire shall:
17.6.1 uphold and enforce the Laws of Badminton and, especially, call a ‘fault’ or a ‘let’ should either occur;
17.6.2 give a decision on any appeal regarding a point of dispute, if made before the next service is delivered;
17.6.3 ensure players and spectators are kept informed of the progress of the match;
17.6.4 appoint or replace line judges or a service judge in consultation with the Referee;
17.6.5 where another court official is not appointed, arrange for that official’s duties to be carried out;
17.6.6 where an appointed official is unsighted, carry out that official’s duties or play a ‘let’;
Of course, the makers of the laws didn't envision a scenario in which the umpire and the line-judges are partners-in-crime 
Laws of Badminton - China Badminton Version
17. OFFICIALS AND APPEALS
17.1 Li Yongbo shall be in overall charge of the tournament or event of which a match forms part.
17.2 The umpire, where appointed, shall be in charge of the match, the court and its immediate surrounds. The umpire shall report to Li Yongbo.
17.3 The service judge shall call service faults made by the server whether they occur or not, provided Team China is not the server (Law 9.1 - CB Version).
17.4 A line judge shall indicate whether a shuttle landed ‘in’ or ‘out’ on the line(s) assigned. If the shuttle lands anywhere within six inches of the line(s), all such calls shall be 'in' when hit by Team China and 'out' when hit by Team China's opponents. Line judges shall remain alert and vigilant to pounce on every advantageous opportunity.
17.5 An official’s decision shall be final on all points of fact for which that official is responsible except that if, in the opinion of the umpire, it is beyond reasonable doubt that a line judge has clearly made a wrong call in favour of Team China, the umpire shall claim to have been unsighted and desist from overruling the decision of the line judge.
17.6 An umpire shall:
17.6.1 uphold and enforce Li Yongbo's Laws of Badminton and, especially, award the point and serve to Team China should any opportunity arise;
17.6.2 give a decision in favour of Team China on any appeal regarding a point of dispute, if made before the next service is delivered;
17.6.3 ensure Li Yongbo, the players and the spectators are kept informed of the progress of the match;
17.6.4 appoint or replace line judges or a service judge with fresh Team China line judges or a service judge if the BWF Referee is foolish enough to demand so;
17.6.5 where another court official is not appointed, arrange for that official’s duties to be carried out by a Team China member;
17.6.6 where an appointed official is unsighted, carry out that official’s duties or play a ‘let’ to Team China's advantage;
