Wu Yu is a math major while Tan Jiao writes mystery novels for a living. The two fall in love on a cruise ship yet end their trip afflicted with varying degrees of memory loss. Wu Yu and Tan Jiao were swept into a whirlwind romance after meeting each other on a cruise ship. However, they both experience some form of memory loss afterwards. Wu Yu has no recollection about the few days after his trip while Tan Jiao lost nearly a year and a half's worth of memories. Wu Yu is a mathematical prodigy and a straight A student with a bright future. His life changes drastically when his mother and younger sister who are his only two relatives are suddenly killed. In order to find the real murderer, he works as a car mechanic and crosses paths with Tan Jiao once more. Adapted from the novel "Wu Yun Yu Jiao Yue" (乌云遇皎月) by Ding Mo (丁墨).