THE supervisor of a man who plunged five floors to his death at his workplace yesterday denied his subordinate was unhappy because he had not been promoted. Tsang Shui-yuen, supervisor of Vitasoy International Holdings Ltd's production department, was testifying before Coroner Warner Banks and a jury in the case of production worker Li Kwok-ching, 44. The jury returned an open verdict on Li, who was found lying on the 11th floor podium of the Hong Kong Soya Bean Building in Kin Wong Street, Tuen Mun, on June 25 this year. Questioned by coroner's officer Peggy Tang, Mr Tsang said Li's performance at work was quite good. Mr Tsang confirmed that although some of Li's colleagues had been promoted, Li had not, but he denied that Li had ever complained. Li's wife, Wong Lai-ping, said there was no reason for Li to take his life and he had been in good health.