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.

After the first night, the participants go about their day. They gather again in the evening to have dinner and drinks. They get to learn about each others’ occupations. Later, the female participants pick a card with a keyword on it. They’ll have a date with the male participants who came up with each keyword.

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.

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?