I'm His Substitute and Rebound Girl

She wants him to love her but will she succeed when the man she's fighting for is still unto his past? Smile, the girl who did everything to save Adrian from his broken past. However, as time passes by, it's getting harder for her to love a broken man so she decided to let go and move on but now he's the one who wanted her to stay-- this time for real not as his substitute and rebound girlfriend. Will they have a happy ending after knowing his ex's reason of their break up?