Ren here tends to fall for people that are bad for him. They were probably a hot mess together, on and off, for a couple of years. Maybe he was a closeted cop. Or a professor teaching him in university with a wife and kids. Or perhaps he was a promising young actor on the rise in the fancy world of stardom and couldn't risk making their relationship known. Perhaps even a famous film director. Whoever he is, they've just met again, living in this same building where strange things keep happening. Maybe things will change now. Or perhaps they'll crash and burn in spectacular fashion again. Open to all ideas. :)
Suggested PBs: JDM, Jonathan Rhys Meyer, Christian Bale, George Clooney, Colin Farrell, Taylor Kitsch, Ian Somerhalder, Bradley Cooper, just to name a few. This is a non-exhaustive list.