Too Mooch Or Not To Mooch - S1.E9

Sanju has had enough of his cute, chocolate boy image and decides to grow a moustache to seem like more of a badass. The plan immediately backfires as Madhu takes one look at him and bursts out laughing. Sanju tries to defend his choice but Madhu just can't seem to take him seriously. Why does he suddenly need a moustache anyway? What's the real l reason behind it and will he be able to convince Madhu to let him keep it?