Actor Siddharth Nigam, who will be seen in Salman Khan-starrer 'Kisi Ka Bhai Kisi Ki Jaan', has said, "Salman sir is my favourite, and he's a mentor to me." Further praising him, Siddharth stated the 57-year-old actor always guides him for the "betterment" of his career, so working with him is a blessing. The film will release on April 21.