Summary
Lee Yu‑joo, an assistant manager in the marketing department, is plagued by insomnia and underperforming at work. At a company dinner, she meets Yoo Hae‑sung, a handsome upper‑class salesperson. They end up spending the night together, and Yu‑joo discovers that sleeping beside Hae‑sung—specifically on his soft chest—miraculously cures her sleeplessness.
Soon, Yu‑joo begins seeking him out not for romance, but as a makeshift “pillow” to help her sleep. The arrangement is casual at first:
Yu‑joo uses Hae‑sung as a remedy for her insomnia.
Hae‑sung, perhaps amused or charmed, continues to indulge her.
As the story unfolds, what starts as a therapeutic convenience morphs into something deeper—emotional attachment, complications in aa workplace setting, and evolving intimacy between two very different personalities.