Bittuji manages RK, Secretary. But RK also was cruel before because he is the one that hit two people in the car initially, Mukund and someone else on a cycle remember, but RK didn't want to do the dirty work with Shamsher Malik he told Bittuji to beat him up, and though he saw the bodyguards come to hit him in the head with those poles he just walked away without caring some serious damage will be caused to him.
Also RK said to Madhu when she went to the hospital when he demanded it when he was revealing all to Malik, I remember RK said how many insects did you mow down to get here on time, so he was callous to the public, definitely a janver but the CV's are softening him now after marriage so he becomes worthy for Madhubala to love him. Had they left him the way he was we would all want her to remain hard and not soften her heart for him.
Similarly Bittuji is also softening like his chief, we commented about the party he didn't like it when his chief was degrading Madhu in front of the guests. But his position is a difficult one because RK is his employer, he has to do as RK demands, otherwise he will loose his job, already he faced a threat when Madhu refused to go to the studio, after recovering from the flu.