First off, i just want to say that the art is beautiful. :3
The story, revolves around the forbidden love between a pair of twins. Except its not that simple. Afterall, there's a reason why this is categorized under psychological. Both of the twins are unstable, twisted and cause demise for those who get too far involved with them. I'm not a fan of incest, and tend to stay away from the category..but in this story, i think it works.
In this manhwa, the emotions are very raw. You can feel Sejun being tormented by his feelings, and how much he really loves Sewa right off the pages. This is probably the best thing about the manhwa and what makes it popular- how well how author conveyed realistic emotions-
Although the characters do things that appear unlikable, i found their actions to be realistic in terms of what people would react/feel like if these story of events were to happen in real life. It goes through the struggles of loving someone you can't have.
This is a dark, emotional, psychologically woven tale with some twisted characters. As you read further, the characters true personalities are developed. For example, Se-wa, initially presented as the crazy one, turns out to be much normal as she progresses. On the otherhand, Sejoon, seemingly stable at first turns out to be the truly crazy one. The story progresses well, and the deeper you read into, the darker and better it gets with some good twists. The mystery surrounding the plot/characters is what kept me reading- i was so curious to find out more about these characters full of secrets.
Unfortunately, there ONE aspect that took away from the overall essence and impact of the manhwa. The artwork and emotions were strong. But there was a lot of overdramatic devices and scenes used, in which i felt like i was watching some lame korean drama. It was like she used the basic formula of a drama and then decorated it with some psycho incest twins. If this was fixed then i would have given it at least at 8..
Anyways, this is a pretty good read if you don't mind incest. It gets you hooked and once you get into the story, you keep wanting to find out more. The art is lovely imo, and the emotions are very strong.