Gia is a normal, yet artistically driven girl. While drawing on a train heading to Prague, she meets a peculiar man named Hayden reading a book. Hayden is seen by many as a handsome, larger than life figure, yet he's haunted by the fact that he has no charisma. While Hayden initially was irritated at Gia, they continuously bump into each other during their time in Europe. Are these meetings fateful, or a hindrance on their trip?

100 Days in Europe is originally a webtoon series which was officially published in book format by Lezhin Entertainment (레진엔터테인먼트) on September 10, 2016. The series was published digitally in English by Tapas from February 15, 2018 to July 19, 2018.