The actors and actresses who played the young version of each character was superb! They really had a great skills and talent
especially Kwak Dongyeon and Ji-woo.

Back to the drama, I do think a lot of fighting scenes were cool but them making Shin Jung Tae looking like a "superhuman" by surviving every episode looks stupid. He is literally bleeding in every part of his body and can barely stand but 30 minutes later his already fine and start fighting again, and in every episode too. That is so so so boring. The first episodes were fine, it was interesting to watch knowing each character, their backgrounds, and the actions scenes. But as it gets longer you'll get tired.

A solid 6/10 for me. Some characters were lovely but the plot was a little bit meh for me.