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우연일까?
After 10 years in the US, Hu-young returns to Korea and meets his first love, Hong-ju, at a café by chance. Just as the window into which Peter Pan flew happened to be Wendy's room. Just as the prince happened to find Cinderella's glass shoes. As if nothing had changed in the past 10 years, Hu-young becomes clumsier only in front of Hong-ju. It’s like going back to the age of 19 when he met his first love, Hong-ju. Hu-young and Hong-ju’s days, which have faded a little, begin to turn into vivid rainbow colors again.
Hu-young comes back to Korea and goes on a blind date that Joseph set up for him. There, he runs into Hong-ju. Upon hearing Hu-young’s return to Korea, Hye-ji plans a welcome party for him. However, Hong-ju turns up drunk, sharing all sorts of things Hu-young didn’t expect to hear.
Hong-ju turns out to be living downstairs in Hu-young's house, and Hu-young asks his uncle to take him on a tour around Seoul. Hu-young and Hong-ju end up having a date at an amusement park, and they have a fun day together. Meanwhile, Joon-ho, who left Hong-ju three years ago, appeared in front of him, asked to work on a project together.
Hu-young realizes that Hong-ju’s ex is Bang Joon-ho, the writer of “My Avant-Garde Lover.” Hong-ju’s boss tells her to work on a project with Joon-ho. Hong-ju hesitates, but she decides to do it in the end. Hye Ji learns that Hu-young has feelings for Hong-ju. Meanwhile, Hong-ju gets into a car accident.
Hu-young confesses his feelings to Hong-ju, but she pretends she didn’t hear it. Hong-ju insists on going home instead of staying in the hospital, so Hu-young takes her to his place to take care of her. Joon-ho sees Hu-young and Hong-ju together and gets the wrong idea.
Hong-ju is forced to go on a fishing trip with Hu-young, Sang-pil, and Wook. Although it’s awkward for her, she tries to enjoy the trip. Hye-ji and Kyung-taek join later, and Hye-ji tells Hong-ju that she’s not dating Kyung-taek. Meanwhile, Hong-ju is told to work with Joon-ho in his studio for a month.
Hong-ju decides to give Hu-young a shot. Hu-young quits his job to stay in Korea and be with Hong-ju. Hye-ji visits Kyung-taek who fell sick and runs into his mother by coincidence. Meanwhile, Hong-ju’s father calls Jun Ho and tells him to stay away from Hong-ju.
Joon-ho tells Hong-ju why he had to leave her three years ago, but even after hearing the reason, she can’t forgive him for leaving her. Hong-ju meets Hu-young’s mom who tells her to end the relationship. Meanwhile, Hu-young finds out Hong-ju’s new project she’s working on with Joon-ho.
Hu-young’s mother tells Hong-ju to come to the US with Hu-young and live there. After hearing that, Hu-young asks Hong-ju to come with him, but she turns him down. Hu-young doesn’t get to see Hong-ju on the day he leaves for the US, but a surprise awaits him at the airport.
