Lee Joo-heon and Seo Kang-woo met at a university drinking party, spent a night together, and became lovers. Kang-woo expected a normal relationship, but he couldn't stand Joo-heon's rough and selfish behaviour, which seemed devoid of emotion at important moments, and eventually broke up with him.

"You're incapable of loving anyone, so live alone for the rest of your life."

Trying to act calm, Joo-heon gradually deteriorates in Kang-woo's absence and eventually goes to find him in a desperate state, clinging to him.

"I'll fix the times I was harsh. I won't do that again... Just let us stay like this for ten minutes- No, one minute."

Unable to refuse Joo-heon's pitiful and desperate plea, Kang-woo helplessly accepts him... The painful regrets and intense love of two people who have lived completely different lives—and the consequences of their actions.

To achieve his goal, Do Won-gyeol uses Gong Hyeon, and Gong Hyeon becomes entangled in a plan destined for a tragic end…