What is the book of poetry she gives him to read in Ep 4?

Maybe Stars take your sadness away ( 2 book set) Korea Drama Poem Goblin dokkaebi by kim Yong Taek


its available online 

Super late reply >_< but I thought it was "The Physics of Love", by Kim In-yook. I don't think the book has been translated into English but you can find it in Korean on Amazon ("Physics of Love 사랑의 물리학").