It's a decent one time watch movie.

But, as the headline says it all, this movie could've been better.
I didn't, at all, get the vibes of Korea in 1988. I'm not a Korean and born in the 90s. So, I truly don't know what it would be in Korea in the 1988. But we do have a parameter to compare it with, Reply 1988. And the only thing common in these two were the presence of Go Kyung-po. Nothing else. Nowhere I got the vibe of 1988.

So, ignoring this basic thing, I would now focus on the story.
Honestly, it was quite good. It was funny, thrilling, entertaining and the actions were good. That being said, there were many glaring mistakes too. I felt that come characters were way underutilized like that of Lee Kyu-hyung. Bok Nam will make absolutely no difference in the story if he wasn't in it. So that's a big flaw. All other characters were good and engaging, but not the same with Bok Nam. But I understand this as it's very hard to give importance to all the characters in a movie with an ensemble cast.
So letting this one slide.
Now I will address another problem, the climax. It seems to me that they tried to copy a bit too much of Hollywood movies like Fast and the Furious. I know it's a movie, but still does it make nay sense to see a car parachuting its way down to the car from a fucking cargo plane. I know it is possible, but this scene is frame-to-frame like that of Fast & Furious 7.

Coming to the acting, I think all the actors did a very fine job. I watched this movie because of Oh Jung-se and Moon So-ri, and I wasn't disappointed by it. Yooh Ah-in was exceptional, so were rest of the actors from his gang.

The best thing about this movie has to be the music. The songs of 80s provided that nostaglgic feel which was missing from the production setting. Korean as well as English songs were used quite well in the form of mix-tape.

Overall, this movie is nice and would appeal to fans and those who haven't watched much of Korean cinema.
But as someone, who has watched many Korean movies and dramas, this movie was way below mark.
Still, the acting and the funny sequences will make it a worth watch.