As life hits them hard, Samuel and Woo-jin decide to work together and blacklist the couples who are cheating on their partners for money. Woo-jin finds targets from the hotel she is working at, and Samuel puts a tail on them. Meanwhile, despite their financial difficulty, they spend the money they made on Samuel’s father’s birthday and Woo-jin’s niece’s academy fee.

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.