Love Countdown (Cashier Meong)

*"You're going to fall to your death?"
"Huh?"
"I'd prefer you to live if possible. Because if you die, I'll die too."*

Seo Hae-Won met a man on a bridge while drunk. He thought they'd accidentally spent a night together, but he told him he'd known Ji-Hun for a very long time. And that's all? At the edge of a cliff in his life, which had seemed so bleak, he nonchalantly reached out.

*"What I want isn't your gratitude, Ji-Hun."
"So... are you saying we should date?"
"Dating won't do. That won't satisfy me. Love me. Just like I love you, Ji-Hun."*

Hae-Won, seemingly stunned by the passionate confession of love from a stranger, simply added refreshingly.

*"Shall we break it down into five stages?"
"... Stages?"
"Stage one is sex, stage two is kissing."*

He'd already had sex and kissed. So what are the remaining stages three, four, and five? And, who on earth is that man in Seo Hae-Won?