That novel messed with my head in the best possible way. The central duo is Song Yu, this super logical guy who's an absolute genius, and Xue Li, the artistic girl with this almost supernatural empathy. Their dynamic is the whole engine of the story – he sees the world as a system of cold, hard data, and she perceives it as a flowing tapestry of emotions and memories.
The 'same dream, same mind, same night' phenomenon that kicks everything off forces these two completely opposite people into this bizarre, intimate connection. They start sharing dreams, thoughts, the whole deal. Watching Song Yu's rigid worldview slowly crack under the pressure of experiencing life through Xue Li's senses is brutal and beautiful. It's less about a romance, though there are elements, and more about a terrifying and profound merger of consciousness. The side characters, like Song Yu's pragmatic roommate or Xue Li's worried friends, feel real but exist mainly to highlight how isolated the main pair become within their shared reality. The ending left me with more questions than answers, honestly, which is probably why I'm still thinking about it months later.