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Woo-jin e Samuel costumavam ser profundamente apaixonados e apaixonados um pelo outro. Porém, depois de muito tempo casados, os dias de desejo sexual já se foram e eles se tornaram um casal assexuado. Um dia, Samuel descobre que seu amigo Jung-soo está tendo um caso. Woo-jin insiste em contar a verdade a Se-yeon.

À medida que a vida os atinge com força, Samuel e Woo-jin decidem trabalhar juntos e colocar na lista negra os casais que estão traindo seus parceiros por dinheiro. Woo-jin encontra alvos no hotel em que trabalha e Samuel os segue. Enquanto isso, apesar da dificuldade financeira, eles gastam o dinheiro que ganharam no aniversário do pai de Samuel e na mensalidade da academia da sobrinha de Woo-jin.

Samuel and Woo Jin look for another target. An old man comes to Woo Jin's hotel and it seems like he is having an affair. Samuel and Woo Jin follow the couple to the mountains and the sea to gather evidence that they can use to blackmail the couple. However, the old man suggested that they meet at his company if they both wanted to get money from him.

Samuel and Woo Jin are having a hard time finding a new target. One night, a couple gets into Samuel's cab, and it seems like they are having an affair. Samuel and Woo Jin try to maintain their relationship when they see the couple passionately making love. They think they have succeeded in robbing them of money. "But Samuel had an accident while running away.

Woo Jin goes to the hospital and Samuel is not in bed. It turns out that Samuel is with Min Soo, his neighbor and cleaning friend in the past. Woo Jin calls him and catches him lying. He decides to follow him to see what's going on.

Woo Jin thinks about his relationship with Samuel and tries to figure out when and where everything started to go wrong. Feeling betrayed, he decides to blackmail the woman next door. Woo Jin interrogates Samuel, and Samuel tells him the secret he's been keeping. Woo Jin is confused, and that leads to big fight. What will this couple end up like?