In this anthology film centered around the theme of "Eros," five separate stories are presented. The main characters from each segment are connected with each other in one way or another.
A man is attracted to the woman sitting across from him on a train ride to Busan. He then gets off the train after her, even though it's not his stop. He is then able to get her phone number. A few days later the man plans to meet the woman for the second time.
Ahn Hye Rim awaits her husband, while hiding, to give him a surprise. Kang Hyeon Woo always worries about his wife being left alone. Hye Rim worries about Hyeon Woo because he will be left alone soon.
On the set of a movie, fresh new actress, Kim Mi Jin, and her charismatic senior actress, Park Hwa Ran, are having difficulties because of their stubborn and demanding director Bong Jan Woon. In the end, the senior actress Hwa Ran transforms Mi Jin into a sexy vixen to seduce the director.
"In My End is My Beginning"
Lee Jeong Ha learns that her husband Min Jae In has just died in a car accident while on a road trip. She then discovers that her husband was having an affair with her old high school friend Kang Na Ru. After the car accident, Na Ru comes to Jeong Ha and asks to live with her under the promise of her unconditional devotion.
"Believe in the Moment"
Three couples are all high school students and close friends. None of the couples have strong convictions about their relationship. They then decide to exchange partners for 24 hours.