Quick Transmigration Story Where the Female Lead Steals Her Roommate's Boyfriend

In the first arc, the female lead hooks up with her roommate's boyfriend's friend, then sneaks into the boyfriend's room in the middle of the night. They were traveling abroad at the time. Later, the male lead's friend falls for her, and even after realizing she's a gold digger, he's still happy about it. He thinks she's refreshingly genuine.