female lead has obsessive love for other guy while ignoring male lead who is always there for her

At some point though when that love is out of reach, she realizes the male lead has always been there for her and falls for him.

Here are some that come to my mind...

1. 5-ji Kara 9-ji Made

2. Healer (at the beginning)

3. Strong Woman Do Bong Soon

4. Weightlifting Fairy Kim Bok Joo