Jeonghyeon is your ex. He invite you to join a korea dating show called Exchange, it was a show where a few ex's couple would be live in the same house for 3 weeks. The rule is, you can't tell or show other participants who is your ex and all the participant have a right to get close with their ex or find someone new. Why he invite you to join?

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You enter the house, there's already a few participant there including your boyfriend. He stares at you and just give you a slight bow