It tells the story of four men in their forties who have been friends since they were eighteen, as they go through love, breakups, successes, and failures.

To his surprise, she doesn't give him the time of day, and he discovers that she has a crush on his best friend Im Tae-san.

Choi Yoon is a lawyer who is still recovering from his wife's death four years ago, but begins to have feelings for Tae-san's much younger sister, Im Meari.

Lee Jung-rok is married to a rich woman, Park Min-sook, but constantly flirts with other women, which causes problems and trust issues in their marriage.

The prologues involve anecdotes about Do-jin, Tae-san, Yoon and Jung-rok's friendship through the years, and they all carry a humorous tone with the exception of episode 16's.

The four guys' primary motive to attend the funeral is just to see the pharmacist's wife and her friends, who are ex-models.

However, before they could pay their respects, a woman holding the pharmacist's illegitimate son arrives and a fight breaks out at the funeral...

Flashback to the four guys in high school, when they apparently get caught for watching adult movies, and the discipline master wants to meet their parents.

When the teacher keeps commenting that he looks familiar, and asks if he's from Busan and whether his father is an undertaker, those are all references to Friend.

[29] The four guys are playing billiards, and decide that whichever team loses will have to pay for the sashimi they'll eat later.

The three guys standing in the second row are thrilled to see the pretty girls in front of them.

The girls are either too ugly or too fat, so the guys aren't interested in them and try to find ways to turn them off.

Jung-rok brags that he's always last in school, Yoon acts like a mama's boy, Tae-san pretends to have a muscular disease and can't stop moving his hand, and Do-jin talks with a lisp.

[23] After they each finish taking a shower, Jung-rok appears in the bathroom with a complete set of facial cream, toner etc.

Then Do-jin enters, and as Tae-san and Yoon tell him about Jung-rok, he quickly hides his eyebrow razor blade behind his back.

As they're playing, they ignore phone calls from Min-sook and Se-ra since they're too busy "burning tanks" to answer.

Shortly after, Jung-rok gets a call from his cafe and Do-jin tells him to answer as it would be ridiculous to go out of business while playing games.

Then a few seconds later, the same employee calls again to tell Jung-rok that expert StarCraft player Lim Yo-hwan is with Jeon.

Upon hearing that, the four guys spring out of their seats immediately and rush to the cafe in a taxi, when the place is just a 5-minute walk away.

Except him, he only has Do-jin, Jung-rok and Yoon...[33] The scene is set to February 16, 1995; around 20 years ago, when televisions were still the analog type.

[34] The scene then changes to some years after that, the four guys are all dressed like Steve Jobs, still talking about their different ideas.

Do-jin comments how great it was for a Korean to make it to the Premier League, and how proud he was of this accomplishment.

The scene ends with Do-jin saying that when they were children, they wanted to be heroes, but now that they're older, they can barely take care of day-to-day business.

Do-jin comments in his narrative that when they were young, they hated older men who did things in a roundabout way.

[35] The scene changes to the present with Colin, Dong-hyub and two other guys in high school becoming good friends.

Actors Jang Dong-gun, Lee Jong-hyun and Kim Min-jong also contributed songs to the soundtrack included in A Gentleman's Dignity OST 2.