9.5/10 This is the first k-drama series that I've watched and it couldn't be more perfect. From the feelings of nostalgia, the friendship, the family affair, to the OST all hit the right spot that made my heart ached. I'm super glad my friend recommended this. Episode #17 & #20 made me cried really hard. Can't wait to rewatch it!. My only complaint was they didn't show what the main characters' futures look like (I was expecting sth like the Parks&Rec finale because the show was set in the past). If only I can see the Ssangmundong squad being friends in their 40s just like they have been their whole lives in the finale.

In a voiceover in E09,
>"A line indicates a limit. Maintaining that boundary means maintaining the familiarity, and the world, the rules, and the relations of that familiarity. This also means if we were to never cross that line, we would never experience the world, rules, and relationships, outside of the boundary. If we wish for a new relationship and new love, we must cross the line. If we were to not cross the line, we will stay that far away from each other." -Deoksun

This applied to the screen as Taek try to open a new door while Jung-hwan crossed the line a little too late as well as real life TT_TT