I am currently on episode 4 and I thought that Min Chae is Yi Jin's daughter. As I was curious, I searched for the cast to know about it. But found out she is not his daughter as they do not share the same Surname. And what's more annoying is that Hee Do's husband is not revealed. There is no relation between the present storyline with Older Hee Do and her daughter and the past. This could have just been a random girl finding the diary and reading the story of her seniors at high school instead of bringing a daughter and older Hee Do. Total waste of time and as from episode 4, I see that the story is going nowhere. It's time to drop it