Byun Baekhyun is a wallflower who likes to observe anyone and everyone. Park Chanyeol is a tall musician who likes to observe Byun Baekhyun.                            

Han Jisoo is a mind reader. She's been able to read the thoughts of everyone around her ever since she was little. When she crashes into a boy with big eyes and a bigger secret in front of the bus stop, her life changes.

Chanyeol needs a roomate, and Baekhyun needs a place to stay. A neon piece of tape down the middle of the appartment. One side is Baekhyun's and one side is Chanyeol's. Will the line be crossed?