Actor Vivek Oberoi was in news for his last released film 'Great Grand Masti'. Now he is in news for his upcoming film. Vivek soon will be seen in action film 'Rai'. Recently, Ram Gopal Varma released the first look of his movie 'Rai' . This film is based on life of Former Underworld Don Muthappa Rai. For few scenes in the film, Vivek has to reduce his 18kg weight for some scenes. He says that to gain or reduce weight, right process is needed. In opening scene, Vivek have to reduce his weight for his youth Avatar. Vivek Oberoi said that it is important for Physical changes roles. Vivek believes that, As actor, we need to change physically for few roles FOr me it's not gaining or reducing weight, but correct process is needed, which don't get effected later.' Vivek close source said that this Sathiya actor is only taking Liquid Diet from one month. Source told, 'Vivek has been said to take too much hot water, Juice and Herbal Liquid Water. Vivek in this film is playing character of Former Underworld Muthuppa Rai. Vivek Oberoi was last seen in film 'Great Grand Masti', this film was not able to impress the box office. Actually, this film got leaked online before few days of releases. Urvashi Rautela, Aftab Shivdasani, Riteish Deshmukh were also seen in the film. This film was directed y Indra Kumar. Producer Ekta Kapoor faced 27 crores loss from this film. You may also know : Vivek Look from 'Rai' Bollywood Movies 2016