The story starts quite nice, but there is no development in the plot till the chapter 80. The characters are nice, and the designs are okay, but the art really isn't good. I'm not saying that the art is ugly, but this is an action manhwa, so you SHOULD be able to distinguish the ATTACKS that the characters are making, but every attack is just a line. You can't follow the fights or understand what is happening with the drawings, you only know the direction it is taking when someone watching comments "he is overpowering her" or "wow, what was that?", and stuff like that. You can't see for yourself, the plot repeats itself a million times, problems are solved before they could ecen become a problem. MINOR SPOILER AHEAD: "MC is 'sleeping' for five years and no one knows when he will wake up, and he is secretly training while asleep to become the most powerful person ever. Meanwhile, during five years, his sister was developing a necklace that will make him 'IMMUNE' to poison, as if she knows that he will become the most powerful person ever and poison will be the only way for his enemies to deal with him".
Mehhhhhhhhhhhh. It starts good, very good actually, and it quickly becomes 100% generic. Not bad, just generic. Read something else.