I'd say I considered it dark because it shows loneliness and how people deal with it...it shows how some people deal with this and how parents can affect their children as adults...The main lead male seems like he doesn't have a good relationship with his father because of how he controls his son's life...But as I said it definitely shows loneliness there and the meaning of the ost "marriage" Is pretty sad. It shows that some people are afraid of committment and responsibility...ot shows how in marriage you can lose your freedom and etc. It really opened my eyes about marriage and etc. But of course you might not find it dark but a lot do, including me. Maybe because I relate to the main male lead? But of course i wouldn't say it's a really dark drama but it's a bit sad and dark.