I think this is based off a webtoon because I swear I've read it. If it's not then perhaps I should lower my score for biting off a webtoon. However, I'll assume it is as a lot of Korean movies are based off webtoons. Another movie I went in for the stellar cast (Hwan Jung Min to be particular). However, in the end, the movie wasn't as engaging as I thought it would be. Too many moments could have been further developed and showcased but because they weren't, it left the script just full of gaps. For instance, more back story on their history and younger selves. They just befriended each other, stuff randomly happened and bam, all grown up. It was rushed and a little unbelievable. Furthermore, the defining moment in their younger years was just terribly written and terribly done. It should have been a far more emotional, psychological and dramatic scene. Instead it ended faster than their lunch scene. They are all also severely in shape and skilled for people who haven't fought in 25 years. Further more, they fight like professionals and even better with minimal training... There's also very little back story on his life after high school. There were just too many gaps to find this engaging. A lot wasn't developed making me not root for the characters that much. The climax of the movie was his last fight but I didn't find myself on my tippy toes severely rooting for his character. Normally, when I root for a character, I get tense and vocal but I realised, I neither cared if he won or not. Overall: Underdeveloped script and characters make for an unengaging plot.