The four pairs of ex-couples gather at a house in Pyeongchang-dong. They nervously introduce themselves, while secretly studying the faces of their exes. Later, they have a proper chat with each other over dinner. Some seem to be hoping to reunite with their former lovers, but some are ready to find new romance.

Each participant gets the introduction letter that is written by his or her ex. They read the letter out loud with all the participants present. Some of them get emotional and even cry while they read it. After reading the letter from their exes, each ex-couple is given a chance to have an online chat and talk about how they really feel after the break-up.

It’s the first weekend since they moved in. The participants enjoy their free time. Later, a letter arrives, delivering shocking news about one of the participants. The participants get a chance to chat with the exes of their dates and learn new things about them.

A new rule gets revealed that one participant’s ex was missing from the start. A new participant makes a sudden appearance at night. In the midst of all this confusion, Gyu-min and Na-yeon go on their date.

The participants get closer through the dates. All of them find out about their ages as well. Hae-eun gets to go on her first date without knowing anything about it.

Hee-doo struggles with his adjustment in the house after an awkward welcome from the others. One of the members helps him get adjusted into the house and the group. New and mixed feelings get revealed between the members after Hee-doo’s arrival.

Two couples go out to date. Some participants put a lot of effort to look good on their dates. The exes who didn’t go on a date get anxious. All the participants gather in the end, and the female participants get to choose who they want to date.

Hee-doo feels upset after seeing Na-yeon. The two express their current feelings with one another. A new room called the Talking Room gets revealed. The female participants get a chance to talk with the ex of the date partner they have chosen.

Everyone except for Tae-i goes on their secret dates. Gyu-min goes on two dates on the same day. This makes him feel a mixture of emotions. The heart-fluttering dates bring the ones on the dates a lot closer and new feelings start to arise.

Hee-doo and Ji-yeon have a secret date, and when Na-yeon finds out, she becomes jealous. The Ex Room, where the participants can reminisce their memories of their relationships, opens for them. For some participants, it’s heartbreaking, but for some, it’s meaningless. Later, they get a chance to talk with their exes one-on-one.

Jisoo X Wonbin, who supported each other's happiness to the X I loved, The first time we had alone The smile that resembled that time suddenly reminds me of the X I loved at the time. peel?

Secret Conversation 'Someone has asked for a secret conversation with you' From X questions that cannot be easily answered, to whether your heart is open to me, a secret but unstoppable conversation between the two of you!

The exes are feeling confused about each others’ feelings. Na-yeon isn’t sure about her feelings after seeing Hee-doo and Ji-yeon’s couple bracelets. Ji-yeon is upset about Na-yeon’s behavior toward Tae-i. On the other hand, Tae-i has a lot of fun on her date with Na-eon. Meanwhile, the participants much choose a partner for their Jeju Island trip.

Jeju-do Nomination Date Nayeon X Hee-doo, who fought even though they pointed out each other, can we forget what happened in Seoul and no longer be entangled in the past? Inconvenient Jiyeon, a strange companion of three people Jisoo X Wonbin, who have had different emotions Now, is it right to say my feelings before it's too late? Speed ​​Up!

Uncomfortable relationship with X The fight between Nayeon and Hee-doo that is still repeated even in Jeju, bringing up the past 'When you see this, we really don't get along' It's sad to see X and other people friendly in front of you. We're not friends." There were only people who couldn't understand and a heart that wasn't understood.

Hae-eun and Hyun-gyu go on a date to ride a fishing boat. Na-eon and Tae-i have a date, making a mirror cover together. Hee-doo and Na-yeon try to talk, but they end up arguing with each other. The next day, participants have a 1-on-1 conversation with the person that they want to talk secretly. They open their hearts and get to know what’s really going on their minds. It helps them to make a new decision.

The participants are given a chance to choose the person they want to go on a date with. However, only those who choose each other can go on a date. Some choose the date they really want, and some make the wrong choice. Later in the evening, they play Truth or Dare to find out how they truly feel.

The participants have one last date with their exes. Hae-eun and Gyu-min have a date that remind them of their old days. Hyun-gyu and Na-eon talk about their honest feelings. Na-yeon becomes certain of the decision she needs to make after a date with Hee-doo. Tae-i also becomes more certain about his feelings toward Ji-yeon.

The day of their final decision has dawned, and they must decide whether they want to get back together with their exes or date someone new. Some have made up their minds, while some are still confused about their feelings. Will Hae-eun choose Gyu-min in the end? Will Hee-doo and Na-yeon get back together? How will Won-bin confess his feelings?