After a major accident, Seorim is burdened with a huge compensation. He ends up having to infiltrate the lab of the genius inventor Gongwoon as a spy. Gongwoon offers to hire Seorim as an adult toy tester, and Seorim, having no other option, reluctantly accepts the offer…
Part timer Myeong-Hun has a crush on sexy Seo-Young, but is confessed to by cute Ji-Eun. Learning their secrets at the crossroad of sexiness or cuteness, their relationship begins to get complicated.