It's a good drama actually but so many plot holes. It's not that i didn't like the ending because BaekDo didn't end up together, i knew it from the start that they won't end up together but the way the writer titled this drama as Twenty Five Twenty One but only gave us (+/-) 2 eps of those age, it's just weird for me. I thought that age will be a peak moment. And also i think the old Na Heedo didn't really take important roles for this drama, if they reveal the Minchae's father maybe the old Na Heedo roles is more understandable but they didn't even reveal it..

And also what happened to Yijin after 2009? What happened about all the rest main characters? I mean eventho Na Heedo might not always being together with them, at least they should give us a glimpse about them after 2009. If there's the old Heedo at least give us the old Yijin...

I feel like the plot was so rushed at the latest eps. But after all it's actually a good drama, if the writer make it more good than this, probably i'm gonna say one of the best drama i've ever watched. Is this recommended? I can say yes, maybe? Honestly i love the plot in the early eps and i love the chemistry of all the main characters especially the squad.