The story itself is nothing original, many have tried to explain the parallel universe concurrently live on. Yet this drama has something unique intrinsically, that is love interconnecting the characters. The execution was wonderful too, keep me at my edge of seat every episode on. There are not many plot gaps, so I can enjoy it nevertheless.

The protecting instinct of a mother contradicts with her duty to nurture her son for a better man. Thus, I can say the fallacy of the motherhood was caused by her disease and her own trait. That being said, the act of multi-murderous of the son too was not all at her mother fault. His own will too caused it albeit his disease may contribute some too.

On the other hand, the ripple of the first murder at the same time causing love sparks. The umbrella was given approximately the same time female ML's father was killed. That love grows for 12 years. In world A it was nurtured closely, while in world B kept silently.

For the acting, both ML gave their best. However, YSY needs to be more subtle expressing his emotions. He seems more fragile than he should be. But I have weakness for KSJ, since I first catch her glimpse at HUSH. In world B she tried to convey her gesture proportionately as to her experience in the world. Contrary to the world A, her walks looks dragged like a lifeless being.

As the supporting was hit and miss. While most of the supporting police force was good acted, both antagonists has some to be said upon. The son is well-acted, portrayed to a sick person to the bone. The mother not so, her acting even in world A was not impressive.

The music was spot on, ending theme performed by Jo Wan Sun illustrating how a lover will never cease to chase his/ her love. Soundtrack too was appropriately accompanying the ambient atmospehere built by the tense suspense.

All in all, the drama is definitely must watch for those crave for love, suspense, and a bit of sci-fi/ mystic drama.

PS: the admins should add the romance genre to this drama ^^