Jin-soo is satisfied with life and tries to make the best of things. When his father disapproves of the girl he likes, he is determined not to give up. However, his resolve is tested with the death of a former classmate and news that his love interest is planning to leave Korea.

晉秀（孔明 飾）在落榜了四次後終於考上公務員，即使薪水不多、戀愛不順，每天都過得很平凡，但晉秀對此感到十分滿足，因為他擅長在任何狀況中，找到能讓自己感到幸福的方法……就業、愛情、友情等，晉秀該如何面對這些令人感到酸甜無比的日常煩惱呢？

　　该剧是以现代人之间流行的“小确幸”为主题，讲述为了克服日程生活中的压力，主角珍秀拥有12种小幸福，并与在这些幸福中出现的女主发生的浪漫故事。