Simple decisions can change a person's fate so suddenly. There are always consequences. Sometimes the consequences are too heavy a burden to carry, buckling under the weight if the guilt. This was truly a tragedy, for each character. Just one managed to find some kind of happiness.
I'm a little scared to read this, I've read two other projects of sensei, and both have their good share of tragedy, and by the comments I can tell this will be an even more sad manhwa.
The story idea is good and thrilling but the way it's told is confusing at best. It's rather chaotic and contains some annoying gaps. It seems like the author tried to tell the story in a cinematic kind of way, but ultimately failed most of the time. I don't mean that everything is bad, it's just very confusing.