[TOMT] [WEBTOON] [2020] A Really Popular Webtoon from 2020 with straight main couple.

So this rant is brought to you by my sister asking me about the first webtoon I read.

OKAY, so basically the Main Male Lead (ML) is a taller dude who has white hair w/ green tips. The Main Female Lead (FL) is like tan (?) with pink hair (?). The plot is that the FL moves into a new apartment that's said to be haunted. As she's living there, she sees the ML and thinks he's a ghost. After Shannagans, it turns out the ML is like from a parallel universe from the FL, but they can sometimes talk in the apartment (?). The male lead is like a pop star in his universe or something. The FL has a lesbian friend who is like hopelessly in love with her or something. They somehow switch universes for like SERVRAL years, then they come back to the FLs universe and kiss? Or something like that. ANYWAYS, SOMEONE HELP ME, IT'S DRIVING ME UP THE WALL!!!