It's after story on the lives of mookyul and ewon. How they are progressing. It was cute and very sweet until it came to the diary part where I started hating mookyul a little. Sorry to say, but mookyul is a kinda a man whore. Putting that aside, it's explains the weird dynamics between the characters before ewon came into mookyul's life and turned it upside down. Hehe. Read it for seeing how mookyul and ewon's story progresses. And if you want to make sense of the father son dynamics. Though I still hate his father. So, it's a moot point for me.
Mookyul's suffering made me cry though I should not hate his adoptive father as mookyul accepted it and didn't think he was wronged.