Of all the dramas Jung Hae In became the lead, I fell in love with him in A Piece of Your Mind. I felt his character throughout the episodes. His eyes really mirrors the pain of losing someone. A heartfelt drama that many can relate to.
Just don't like the female lead tho. I wish it was someone that is more emotional. I saw some of her dramas and she has the same vibe or feeling in all of it. I didn't see the character she is portraying.