Wow! 'Why her? ' Is one of the best k dramas I've ever watched, from the storyline to everyone who worked on and off screen and the best of it is the female lead. The acting was so good I couldn't stop watching it. It's intense, keeps you on the edge and you can't stop after the first episode. Romance and mystery all in one.
Unfortunately, we live in a world where people with power and money rule. What this drama taught me, even if everything and everyone is against you there is still hope. You should never give up. The truth always comes out in the end.

There will always be some people who will fight for what it's right.

[spoiler] I loved how Gong Chan chose to forgive Oh So Jae's mistakes when he found out about her betrayal because he truly believed that 'Everyone makes mistakes'. [/spoiler] Mistakes are easy. The hardest part is to admit you made a mistake and have the courage to face and fix it. At the end of the day you have to live with the consequences of your actions and mistakes.

For me it's a must watch.