Worth watching, one of the best K-drama ever. In my opinion, the love can be compared with What happened in Bali, A Love Story, and Reply 98. I cried twice when they broke up. The heart is still willing, but ambition controls them especially on the part of Back Hijin. If the diary would be read earlier before the Na Hee do got married, it won't change because if they are willing to return to each other it would be easier with telephone and connections. Some beautiful love story only comes once, and it was during 25/21!