Kamal :
1st scene :
He seems very professional and abide by rules.. I see myself here in this sense.. even if they are friends, rules should not be bent.. no concessions... if we are right, there is 0% chance for others to question you..
Last scene :
Initially they discussed about school days and how he miss home food... Even after Karthik entered, KH kept quite and hesitated to eat.. It was Raji who started to irritate Karthik...
Madhavi :
She is just a show-off.. The smile says, 'Karthik is weak in Raji matter and wants to irritate her' .. Now Madhavi got a knot as how to get rid of Karthik's anger on her... She wud take advantage of this situation... I don't think she wants to separate KR.