Any shows where the female lead is in love with the second male lead, but she's falling for the male lead without realizing it? Maybe the male lead sees her and the second male lead in a romantic situation, and she doesn't want him to see this not realizing why. Eventually she does and the leads get together after she rejects the second male lead.
In Time With You - the TW original source for "The Time We were not in love" Also, " I don't love you yet", the recent J version. Not quite as good overall as ITWY, but well worth a look, it has some lements I actually prefer