I need help finding this one M/F romance manga. The FL sells makeup and she’s a really g...

I need help finding this one M/F romance manga. The FL sells makeup and she’s a really good saleswoman, then on her day off, she sees the ML, a foreigner, wandering around. They have a one night stand, and she assumes she’ll never see him again blah blah then they meet again. The FL has brown hair and I think the ML has grey hair