Daechi, the place with the most enthusiasm for academia in Korea. 'Yunim' who once dreamed of becoming a novelist lives out her life as a Korean instructor in Daechi. However, on the day the midterm exam is about to end on the middle school where Yunim is in charge of, the teacher of that school comes visiting Yunim. The schoolteacher 'Kihaeng' is Yunim's ex-boyfriend 10 years ago. Now, the two becomes the topic of gossip among the parents of Daechi.

Kim Ji-young, an ordinary woman in her 30s, suddenly shows signs of being inhabited by other women from her life, past and present.

Chang-sik, a retired man, lives with his wife, Gilsoon and her caretaker, Soo-ok, an illegal immigrant. One day, a bedsore develops on Gilsoon, which does not seem to heal. Even though Gilsoon is in poor shape, Soo-ok insists on taking time off on weekends. Chang-sik realizes Soo-ok is trying a sham marriage for a new visa. Upon hearing this, Chang-sik suggests they get married.

Seoul, 2008. On a bus heading to their hometown, fate brings Eun-ho and Jeong-won together, sparking an unlikely friendship. While battling a bustling and weary city life, they find themselves sharing lofty dreams and a love that comes to feel extraordinary. But, eventually, the harsh realities of life lead them to part ways. Over a decade after the separation, the two unexpectedly reunite on a flight back to Korea, where they reflect on their lost time.