Please help me find a title

Hello, I’d appreciate some help if possible on finding the name of a manhwa. It’s about a male and female who are already a couple when it starts. He works an office job and went out for drinks with his co-workers, a female co-worker was plotting on him because she liked him. She lied that they spent the night together, after (I’m pretty sure) she pressured him while drunk to stay over at her place. When he woke up he was alarmed and even more so when he was told he supposedly cheated. FL kind of finds out on her own/with assistance, she was a bit insecure already and questioning his loyalty. Manhwa itself is an unhealthy relationship, poorly planned and executed moves on his and her part. I’m pretty sure there is a second male lead who was also kind of in on the whole scandal to try and get the FL for himself. She had darker hair and his was brown I think? She goes a bit crazy and starts plotting revenge on them and he desperately tries to hep her and prove himself. Written out, this makes sounds like a shit show lmao. Please an thank you for any help, completely lost the name after the shutdown but remember the cover with both them on it at the time.