Suk Moo is a very picky and sensitive man; Hwi Roo is a relaxed and positive woman; they stay married for three years, but they still quarrel over every single thing; during a tough day at work, Suk Moo meets his ex-girlfriend.

Suk Moo and Yoo Young go out for dinner together, and Suk Moo tells her about how he met and married Hwi Roo; Hwi Roo sends a text to Suk Moo as a suspicious guest arrives at her guest house; Suk Moo is too busy with his own business.

Suk Moo runs into Jang Hyun on the street and ends up going to his grandmother, Mi Sook's cafe; Suk Moo gets to talk to Yoo Young again; Ma Roo tells Suk Moo where Hwi Roo is, and Suk Moo heads to Hwi Roo's hometown.

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

Suk Moo realizes that Yoo Young had no happy memories with him; Suk Moo and Hwi Roo argue again over petty things; 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.