Looking for an older josei/smut manhwa (read around 2019–2021). The girl has dark purple/blue hair. At a graduation party she is intentionally drugged by some men, a black-haired man rescues her, but she ends up sleeping with him while intoxicated. She can't remember his face afterward, only that he has a tattoo on his lower abdomen/hip. She spends years sleeping with different men trying to find him, then later gets a job at a café where her boss turns out to be that same man. Neither of them recognizes the other at first.
the characters visuals reminds me of sunsun. it's so fun reading it.