赵硕武是一个小区的物业工作人员，妻子姜辉璐是一名小学体育老师，两个人结婚三年，赵硕武敏感细致，做事认真负责，每天不厌其烦处理业主们各种棘手的事，可妻子却是一个大大咧咧，不拘小节的人，三年来，他们夫妻俩从结婚开始就争吵不断，感情越来越淡漠，赵石无无法忍受这样的生活，时常想到离婚。

赵硕武迫不及待回家翻看以前的相册，往日美好甜蜜的日子一下子涌上心头，甄银英温柔可人的样子还历历在目，可眼前的姜辉璐却实风风火火的，他的心里五味杂陈。

姜辉璐受那对外国租房客的启发，特意精心打扮了一番，还涂了口红，就是想给赵硕武一个惊喜，可他根本就没有发现，继续一边吃饭一边看书，姜辉璐不小心把水洒在桌子上，赵硕武不由自主叹了一口气，对她横加指责，姜辉璐心里委屈，就赌气洗掉嘴上的口红，独自坐在家门口暗自神伤。

姜辉璐和赵硕武办理离婚手续，看到一对年过花甲的老夫妻竟然也来离婚，姜辉璐唏嘘不已，不知道他们的婚姻遇到了什么问题，她一直觉得他们俩分歧就是因为赵硕武没有吃到长崎蛋糕这么简单，赵硕武被她偏执的想法气得无语，还举例说明婚姻的解体不是因为具体一件事，而是日积月累的失望与冷漠。

Suk Moo and Hwi Roo visit Suk Moo's father, Koo Ho's birthday party. After having a birthday party, Suk Moo and Hwi Roo head to Suk Moo's grandmother, Mi Sook's birthday party as well. Meanwhile, Suk Moo sees Jang Hyun with another woman and tells Yoo Young about it.

Suk Moo is shocked to realize that Yoo Young had no happy memories with him. At home, Suk Moo and Hwi Roo argue again over petty things, so they end up deciding to put up some rules to follow. They try to show each other that they’re having a fun time by their own, and it leads to a childish fight over social media.

Suk Moo hurts his back while trying to help Ma Roo. Jang Hyun helps him get home, but they find that Yoo Young and Hwi Roo were having a chat together at Suk Moo’s house already. The two couples talk together about each other’s relationships, and they all get shocked after hearing why Yoo Young broke up with her ex-boyfriend.

Suk Moo feels terrible after hearing what he had done to Yoo Young so many years ago. He wonders if Hwi Roo decided to divorce him because of the same reason. Hwi Roo goes out to watch a movie with Shi Ho and realizes how Suk Moo must’ve felt. Meanwhile, the real estate agent calls Hwi Roo and tells her that they’re coming to see the house.

Hwi Roo tries to tell Mi Sook that she and Suk Moo are getting divorced, but she fails to do so. Tae Hyun gets an aloe from Hwi Roo and prepares dinner to thank her, but Hwi Roo goes out as soon as she comes home that day. They end up arguing again, and Tae Hyun feels sorry for Hwi Roo. However, things only get worse.

Suk Moo goes out to find Hwi Roo, and he sees that she met with Yoo Young. He keeps watching them but ends up losing control of himself once he sees some guys hitting on both Hwi Roo and Yoo Young. Meanwhile, Yoo Young calls Suk Moo and tells him that someone ran away after breaking her window.

Jang Hyun confesses to Suk Moo that he didn’t hand in the marriage registration and Yoo Young knows nothing about it. After another day of work, Suk Moo returns home and sees that the man Hwi Roo has been meeting was Shi Ho. He goes out for a walk out of frustration and comes across Yoo Young again.

Suk Moo and Hwi Roo hand in their divorce application and try seeing each other as strangers. Hwi Roo’s dad gets hospitalized at a hospital in Seoul, and everybody gathers there. Meanwhile, Suk Moo tells Jang Hyun that Yoo Young knows about the marriage registration now.

Suk Moo’s family and Hwi Roo’s family gather together to get a family photo. Suk Moo’s grandmother sees that Hwi Roo has brought Shi Ho home and overhears that Suk Moo and Hwi Roo has gotten a divorce. Meanwhile, Hwi Roo changes her mind and tells Jang Hyun that they should go camping together.

Suk Moo and Jang Hyun find the girls having a party. Suk Moo, Hwi Roo, Yoo Young, and Jang Hyun decide to go on a trip together. Mi Sook realizes that Suk Moo and Hwi Roo were trying to sell their house. Meanwhile, Soo Kyung’s friend visits the Mi Sook’s restaurant to see Soo Kyung.

A newlywed couple make a mistake and think Suk Moo is with Yoo Young while Jang Hyun is with Hwi Roo, so Yoo Young and Hwi Roo each talk about their good and bad traits. Suk Moo catches a cold after sleeping in the tent. Jang Hyun suggests going to a hotel for their second night. Meanwhile, Suk Moo and Hwi Roo get into a heated argument after getting drunk.

Suk Moo and Hwi Roo are shocked to realize what they did last night after getting drunk. Jang Hyun ends his relationship with other women and prepares himself to concentrate on Yoo Young. Meanwhile, Jang Hyun and Yoo Young realize that Suk Moo and Hwi Roo kept looking at each other during the trip.

Soo Kyung gets sick and gets taken to the ER. Ma Roo gets extremely worried about Soo Kyung, and she bursts out in rage as she hears what Soo Kyung’s mother says over the phone. Meanwhile, Yoo Young’s sister visits Yoo Young and triggers what she had been trying to deny while being with Jang Hyun.

Suk Moo gets worried as he keeps seeing Yoo Young jogging alone. Yoo Young goes out to a bar, but she just finds herself disgusted. Suk Moo finds Jang Hyun and tries to take him home, but he comes across Hwi Roo and Yoo Young on the way. The four of them end up sitting at a table and discussing about how they each feel.

Yoo Young and Hwi Roo come across each other while grocery shopping, and they start talking about Suk Moo’s habits. Suk Moo works for a night shift, but Jang Hyun suddenly calls him over. Meanwhile, a publisher company calls Hwi Roo and tells her that they are interested in her book.

Suk Moo takes Jang Hyun home and asks Yoo Young to let him take his clothes. Jang Hyun keeps wandering physically and mentally after hearing that Yoo Young doesn’t want him anymore. Meanwhile, Hwi Roo realizes that Suk Moo had much held inside himself for her sake and decides to be nicer to him.

Suk Moo keeps trying to find where Hwi Roo went. Hwi Roo continues to work on her storybook. Jang Hyun starts living at Suk Moo’s house, but he just can’t forget about Yoo Young. Meanwhile, Hwi Roo’s father visits Suk Moo’s house and asks Suk Moo where Yoo Young went.

After seeing his grandmother going out for curling, Suk Moo thinks he could finally find Hwi Roo and follows her to the curling center. Hwi Roo ends up meeting her father and admitting that she and Suk Moo got divorced. Meanwhile, Yoo Young finds Suk Moo wandering around and walks up to him.

Yoo Young suggests sleeping together with Suk Moo and goes to a motel with him. Suk Young pulls out a petition for divorce and gives it to Myung Geun. Hwi Roo gets extremely drunk and ends up kissing Jang Hyun. Meanwhile, Jang Hyun manages to tell this to Suk Moo while Hwi Roo apologizes to Yoo Young.

Hwi Roo is shocked to hear that Yoo Young tried to sleep with Suk Moo. Suk Moo tries to avoid Jang Hyun, but he keeps asking what happened between Suk Moo and Yoo Young. All four of them happen to come across each other all at once and end up having a heated conversation at Yoo Young’s house.

Yoo Young tells Suk Moo that she’s carrying Jang Hyun’s child. Hwi Roo finally gets her story printed into a book. Jang Hyun gets hospitalized after falling off from a rooftop. Suk Moo tries to keep his mind on his own life, but things seem to keep bothering him. While talking with Jang Hyun, Suk Moo realizes why he had been acting like that.

Hwi Roo gets a publishing party to celebrate completing her book. She invites everyone including Suk Moo. Suk Moo realizes what he has done wrong to Hwi Roo. Meanwhile, Mr. Oh confesses that he has feelings for Hwi Roo in front of Hwi Roo and Suk Moo at the dinner after the publishing party.

Hwi Roo moves into the rooftop house, but she keeps thinking about Suk Moo. Jang Hyun goes to a party to see his old classmates and meets Se Jin. Se Jin and Jang Hyun visit their old school together, and Jang Hyun realizes what he lacked. Meanwhile, Suk Moo’s grandma collapses after returning from her friend’s funeral.

Suk Moo’s poor choice of words makes his parents realize that he and Hwi Roo got divorced too. Suk Moo’s father feels devastated as he finds out that both of his kids got divorced. Jang Hyun and Yoo Young decide to get back together and get married. Meanwhile, Suk Moo quits his job.

Hwi Roo sees Suk Moo singing alone in his house and feels relaxed after checking that he wasn’t hurt. She also sees that Suk Moo has been trying to change himself. They decide to go out for a dinner at a buffet, but Hwi Roo sees that Suk Moo can’t change himself despite his efforts. Meanwhile, Jang Hyun tries his best to not make Yoo Young nervous.

Suk Moo’s parents take Hwi Roo and Suk Moo to Hwi Roo’s parents. They sit together to have a family meeting and discuss about the divorce, but the neighbors barge in and start a party to celebrate their visit. Meanwhile, Yoo Young gets a call from her sister and visits Geoje to see her mom.

姜辉璐送赵硕武无到车站，赵硕武掏钱买票的时候，突然掉出来煤气缴费通知单，他借口太忙还没来得及去交，姜辉璐目送他去上车，刚想转身离开，发现自己手里还拿着那个装小菜的袋子，立刻买了一张站台票，跑着给赵石无送过去，赵硕武看着她气喘吁吁走近，情不自禁紧紧抱住她，大庭广众之下深情地吻住了姜辉璐，末班车从他们的身边呼啸而过，两个人一起上车回首尔了。

赵硕武无绞尽脑汁为李章贤和甄银英的婚礼想贺词，姜辉璐给他提了很多好的建议，赵硕武突然醒悟，只有向心爱的人敞开心扉，才能做到彼此理解，只有真的爱自己才能得到真的幸福。婚礼前一天的晚上，李章贤夫妇约姜辉璐和赵硕武一起庆祝单身，李章贤提议四个人一起生活，如果他和甄银英生气，就去投奔赵硕武，甄银英也劝他们尽快复婚，姜辉璐声称只有一个人生活得精彩，两个人一起过日子才不会乏味，李章贤透露赵石无婚礼上的歌曲是唱给姜辉璐的。