Marketing team representative 'Yuju Lee', who couldn't sleep and failed one project after another, slept with 'Haeseong Yoo' 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 Haeseong's soft chest was the cause, Yuju ends up using Haeseong as a means of treating his insomnia.. 'Haeseong Yoo, be my pillow'.