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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... So the four guys split what they need to do.

The four guys are gossiping about their friend, when Do-jin said they're at an age where they don't even know if someone likes them. As they're chatting, they see a woman wearing a very short mini-skirt, so their eyes are drawn to her. The woman bends down to pick something up, and the guys all lower their heads as well trying to look up her skirt.

While at a club, the four guys spot a pretty young woman and through a waiter book her for their room. They lie to her about their age, saying that they're 31 ("oppas") instead of 41 years old ("ajusshis"). Then Tae-san says she looks like one of their ex-classmates, and the girl says that he's her father! The four guys run away from the room.

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. At the field, each vows to admit that he's the mastermind, and promises that they'll all get punished together. However, when in front of their teacher, Jung-rok admits it, but Tae-san, Yoon and Do-jin all point to Jung-rok saying he did it. So in the end, only Jung-rok gets hit. There's a bit of an inside joke in the scene. The teacher is portrayed by Kim Kwang-kyu, the same actor who played Jang Dong-gun's teacher in the 2001 movie Friend. 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.

While in Jung-rok's cafe, the four guys are seemingly talking about economic issues, but the topic is actually the K-pop girl group Girls' Generation (SNSD). Do-jin says he likes Taeyeon, Tae-san likes Yuri, and Jung-rok likes Tiffany. But Yoon says they should care about their country as much as they care for those girls, giving the impression that Yoon isn't interested in SNSD. Suddenly, while he's talking, Jung-rok sees Sooyoung, and the other two goes gaga over her too. Tae-san wants to ask Yoon to get Sooyoung's autograph for him, but before he finishes his sentence, Yoon has already disappeared... to talk to his favorite SNSD member Sooyoung at the counter. Yoon asks for her autograph, and even starts dancing to some of SNSD's songs. The other three guys are left stunned.^[29]

The four guys are playing billiards, and decide that whichever team loses will have to pay for the sashimi they'll eat later. Do-jin and Jung-rok are on one team, Tae-san and Yoon on the other team. As the game continues, they take it more and more seriously. Do-jin even leaves the shop forgetting to change out of his slippers.^[30]

The night before Jung-rok's wedding, the other three guys go to Min-sook's house to give the marriage chest. Three women come out, wearing expensive jewelry. Yoon starts singing and the other two guys dance. The next day, at the wedding, Jung-rok is all smiles, but Min-sook looks angry. The reason is that the groom's female friends are younger and prettier than the bride's. The three guys standing in the second row are thrilled to see the pretty girls in front of them. Do-jin narrates, "Everyone else is happy, except the two who are getting married."

Set during their college days, the four guys go on a group date with three girls. 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. Suddenly the fourth girl arrives and she's so pretty that all four guys fall for her. She is Kim Eun-hee, the four guys' first love.^[23]

After they each finish taking a shower, Jung-rok appears in the bathroom with a complete set of facial cream, toner etc. Yoon and Tae-san mock him, saying how can a guy care so much about his looks. 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. But the guys catch him anyway, and Jung-rok ends up asking Do-jin where he bought the pink set.

The four guys are playing StarCraft, Do-jin and Jung-rok VS Tae-san and Yoon. 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. The employee says that actress Jun Ji-hyun is at the cafe; the four guys are surprised but continue playing, with Jung-rok telling his employee to hook up Jeon with coupons. 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.^[31]

The scene starts with the four guys at a park, deciding who should build the tent. Then when they wanted to start their picnic, they realized that all of them brought only alcohol, no one brought food. So Jung-rok said he'll trade some alcohol with the girls camping near them, who have much food. However, the girls said they've already traded with the other guys playing basketball. So the four guys decide to play a game with the youngsters, with Do-jin saying the youngsters will be embarrassed because of his good skills. The game starts, the four guys make a lot of mistakes, they're out of breath... They lost all the liquor they brought with them. They then asked Do-jin when was the last time he played basketball, and he said his last victory was 18 years ago in 1994 (a pop culture reference to actor Jang Dong-gun's hit 1994 basketball drama The Last Match).^[32]

As suggested by Yoon, the four of them decide that they should quit smoking. However without their cigarettes, they can't concentrate on anything they do, so they decided to find a thing to focus on. Tae-san goes to the gym, but ends up smelling the guy beside him because the guy just finished smoking; Yoon eats sweet stuff like waffle sticks and lollipop, but ends up treating the waffle stick as a cigarette; Jung-rok chooses the NC-17 method; Do-jin grows plants, but ends up plucking all the leaves from the plants and crushing them in a pot, with a 'cigarette' in his mouth. The process did not go smoothly, but they do end up quitting smoking.

Scenes show each of them breaking up with their girlfriends, and whenever one does, the other three will be saying, "Hey! You forgot one woman with another woman!". But in Tae-san's case, he was drafted for the military. On the day he has to leave, the three guys come to send him off but Tae-san doesn't want them to, because the rest of the guys who were also drafted all have their girlfriends to bid farewell to. 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. Do-jin, Tae-san and Yoon are watching a hit drama's finale. After the drama finishes, Jung-rok comes home and asks what happened but they refuse to tell him. So Jung-rok takes out his cellphone, saying he'll call his mom to find out. The three guys are so fascinated by the cellphone, they tell him the drama's ending and take the phone to play with it. Then they start listing the current technology that the world didn't have 20 years ago.^[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.

Yoon's wife dies and the three men rush to his side and cry together.

The scene starts off with the guys reminiscing about the 2002 World Cup. 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. Jung-rok enters with a cake with Robot Taekwon V decorations on it, and starts talking about how when he was a kid, how much he worshipped Taekwon V as his hero. The others start commenting on who their heroes are. Yoon picks Superman, Do-jin picks Batman, and Tae-san picks Spider-Man. They argue about who is the best, with Jung-rok interrupting the conversation several times saying that Taekwon V is the best. 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. He wonders who would look upon them as heroes.

The 4 are in Yoon's car stopped at a red light singing "Hotel California," when they're hit from behind by a young man whom they believe is driving his father's car. The 4 decide to make a show of it, and get out of the car pretending to have neck injuries. The young man also gets out of the car, and asks if he can make a phone call. The guys all grab their own phones and pretend to be calling a variety of people. Yoon pretends to be calling a lawyer, describing the accident. Tae-san pretends to call the police chief, saying that although he's not hurt badly, his neck hurts, and with a neck injury, one never knows. Jung-rok pretends to call his wife, telling her to tell everybody who is anybody about the accident. Do-jin pretends to call a crime scene investigator. As they finish up their calls, the young man also makes a call. The 4 assume that he's also going to make a fake call. It turns out he's calling the insurance company, and is informed that they will arrive in 10 minutes. The young man asks if they are okay. They go sit in Yoon's car while waiting for the insurance representative. Do-jin comments in his narrative that when they were young, they hated older men who did things in a roundabout way. He realizes that now, they've become the kind of people they hated when they were the young man's age.

Yi-soo, Se-ra, Meari and Min-sook enter a restaurant where the men are waiting. They are wearing revealing clothing and the men use napkins to cover them up. When the women go to the bathroom, the men talk about how they hate it when women wear revealing clothing and other guys look at them. Suddenly a girl enters the restaurant and their eyes are drawn to her. The woman bends down to pick something up, and the guys all lower their heads as well trying to look up her skirt.

The scene shows how the men first met in high school. Tae-san enters the classroom and demands to know who's the strongest in the class. Do-jin answers that he is. Jung-rok enters and asks who owns the sneakers he's holding, and Yoon puts up his hand. The four boys go outside and start fighting.^[35] The scene changes to the present with Colin, Dong-hyub and two other guys in high school becoming good friends.