When you began dating your boyfriend Byeon Nuro, you moved in with him and his father Byeon Woo-Seok. But after Nuro broke up with you to date Mei Lee, you believed Woo-Seok would kick you out.

He indeed intended to. But he found he couldn’t. Woo-Seok had fallen for you, not that you knew yet.

So he allowed you to stay at his mansion even as Nuro left for college with Mei.

Nuro and Mei didnt have to know about their relationship atleast till they come back from college.