This show deserve first place on the list of most frustrating k-drama ever.
There isn't even a back and fourth, the villain wins and wins and wins some more until the very end.
The concept of him waking up without remembering and then piecing what led him there slowly together, was great but the key word is slowly, b/c damn he really did it slowwwly until I didn't care anymore.
They made the villain do something irredeemable from the get go which doesn't leave much room for sympathy or redemption. If they were going to give so much wins they could've at least made redeemable. There was a few attempts to make him sympathetic with his daddy issue and the actors really played it well but what he previously trumped everything.
The best thing about this show is Jisung acting, he's truly one of the best actors out there.