Han Si-woo, a poor college student, injured his leg in a delivery part-time job accident and couldn’t work for four weeks. The remaining balance in his bank account: 12,473 won.

At that moment, he happened to discover a high-paying clinical trial for a new drug and applied immediately.

On the shuttle bus heading to the research center deep in the mountains, he unexpectedly reunites with Park Ha-young, a female friend from the same department. After arriving at the research center, he also spots Yoon Seo-yeon, the most beautiful girl at their school, and her close friend Na Ye-jin.

Then they say they’ll conduct a physical fitness test and a medical examination…

…Something about this part-time job feels strange.