For genius actuary Ki-jun, divorce was the worst disaster of his life. Determined to turn it into an insurance product, he forms a team with his recently divorced neighbor, Han-deul, as an underwriter, and his ex-ex-ex-wife, Na-rae, as a quant. Thus, the divorce insurance project officially begins.

The team is astonished to learn that Na-rae, who joins the task force as a special advisor quant and a senior managing director at Plus General Insurance, is also Ki-jun’s ex-ex-ex-wife, though the two seem surprisingly unfazed. As the team pairs up to gather data for the divorce insurance policy, Ki-jun takes Han-deul to an unexpected place seemingly unrelated to their research.

The team works tirelessly, fully dedicated to developing a divorce insurance policy. After much effort, the team finally secures conditional approval. But to everyone’s dismay, Ki-jun leads them to a wedding fair to meet their subscriber target. However, Han-deul suddenly cancels all sign-ups at the fair, abruptly halting the plan for reasons unknown.

When Han-deul bumps into Ki-jun, weary from a run-in with his former brother-in-law, they begin to understand each other's demons of the past. Meanwhile, Na-rae and Jeon-man click and spark a mutual attraction, and Ah-young meets dancer and farmer Woong-sik on a blind date. However, as the task force gains momentum, they face a new challenge— rising divorce rates among their clientele.