孔马成（崔振赫 饰）是一名拥有超高智商的天才医生，深受患者和领导的信赖。然而，一场意外的发生让孔马成患上了短期记忆丧失症，他总是会忘记前一天发生的事情。受病情影响，孔马成只得告别挚爱的职业舞台。 朱喜悦（宋昰昀 饰）曾是红极一时的女明星，虏获了大批粉丝们的喜爱，星途一片大好，可是，3年前一场恐怖的杀人案令朱喜悦的名声跌落谷底，之后她就一直苦苦挣扎在过气的边缘。曾经，孔马成和朱喜悦之间有这一段浪漫的往事，但也是因为凶杀案的发生导致两人失去了联系。如今，早已物是人非的两人再度相遇。Gong Ma Sung is a successor to the Sunwoo company. Life seems to be going well until he gets into a car accident while trying to help a woman. Since then, he suffers from memory loss where his memory lasts only a day. Every night before bed, he writes notes about what happened to him that day and the next morning he memorizes everything that happened. Gong Ma Sung then meets Joo Gi-BBeum, a formerly well known actress, and falls in love.
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