We Are a Matter of Time / 우리는 시간문제 Rent-free living? What's the catch? When her mom gets a new boyfriend, 19-year-old Soohyun decides to move out. In a stroke of luck, her college classmate Yujin offers for her to move in for free, no strings attached. But Yujin has a hidden motive... Will her secret affect their dynamic as roommates?