A businessman who turned his former partner into a human torch while trying to force him to sign an IOU for $300,000 was jailed at the Court of First Instance for seven years yesterday. Li King-lun, 32, clutched his head as he was described as 'cruel' by Deputy Judge Wesley Wong Wing-fai. The court heard that the victim, Cheung Wai-man, 30, was tied up when he visited business premises in Yau Ma Tei seeking the return of $40,000 in share capital. His trousers were cut open, inflammable liquid poured over him and he was set on fire. The flames were quickly put out but Mr Cheung was left with burns to 40 per cent of his body. Despite skin grafts, he has been left with scars. Li was found guilty of wounding Mr Cheung with intent after denying the allegation. The attack took place on July 21 last year.