Not all sweet as there's angst but:
+1 Lovely Runner
Crush (ML is a songwriter, FL is a radio dj and a fan)
Destined to Meet You (ML is a bar singer, FL is bar customer becoming a fan as ML is handsome)
Itaewon Class (ML is a start-up food business founder, FL is an internet-celebrity and a fan since ML save her multiple times)
Love Lasts Forever (ML is a doctor, FL is a nurse and a fan since she's younger because ML save her ehm family member?)
Only for Love - side couple (ML is a professor who often talk in TV and magazine, FL is a reporter who's becoming a fan)
ah, and every Itazura na Kiss adaptation, the latest is maybe? Fall in Love at First Kiss (a Taiwan movie) FL even has a blanket with a full size photo of sleeping ML facing her side