Marketing team representative Lee Yu-Ju, who couldn't sleep and failed one project after another, slept with Hae-Sung from the sales team whom he met by chance at a drinking party, and slept so soundly that he was late in the morning..? After finding out that Hae-Sung's soft chest was the cause, Yu-Ju ends up using Hae-Sung as a means of treating her insomnia..

"Hae-Sung, be my pillow"

(Source: Mr.Blue, translated)