Oscar's name is not revealed until EP9, but the character is already seen at the dorm party in EP8. Oscar is related to Tara in some way. At least that's what it says in the bios.
There is something strange about this scene, namely Tommy. Tommy had asked the MC to watch his sister without mentioning a name. When the MC explained the situation to Tommy, the MC said that he was looking after his sister. The MC did not mention any names either. We see Zoey and Josy. Actually, Tommy should pat the MC on the back and thank him. So why is Tommy running after Oscar? Does he perhaps not know which of his sisters, Zoey or Josy, the MC was looking out for?