While he is on a cruise ship, the math whizz Wu Yu (Jin Han) meets a woman named Tan Jiao (Li Yi Tong), who writes web-based mystery novels. They hit it off and begin to develop romantic feelings for each other. But after the journey is over, they both suffer differing amounts of memory loss. Wu Yu's life is also turned upside down when his sister is killed and his mother dies shortly after. The two meet again by chance after many months apart, but things have changed for both of them. Wu Yu has become an auto mechanic who spends his time in melancholy - and trying to get to the bottom of what happened to his family. Tan Jiao does not immediately recognize him, but still feels the pull of attraction toward Wu Yu. But as they try to work out what happened to their memories - and search for the person who killed Wu Yu's sister, they begin to wonder if something very strange happened on the cruise ship.—Rakuten Viki

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 (Jin Han) and Tan Jiao (Li Yitong) 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.—ChineseDrama.Info

Tan Jiao is a web novel writer and partakes in a cruise to research ideas for her next novel. While on a cruise excursion, Tan Jiao is saved by Wu Yu, an astrophysics genius and they become attracted to each other. Tan Jiao returns from the trip and goes to repair her car, meeting Wu Yu once again. However, there's something different about Wu Yu, once a Ph.D. student with a bright future, Wu Yu is now a car repairman with a haggard look. Tan Jiao couldn't understand how Wu Yu could change so much within a short time, but she soon discovers that the two have mysteriously lost different lengths of their memories. Together Wu Yu and Tan Jiao travel every two weeks between time and space from the cruise to their world to solve the mystery behind their memory loss and the murder of Wu Miao.—DramaWiki

Wu Yu is a math major, but works as a mechanic, while Tan Jiao writes mystery novels for a living. The couple meets by accident when Tan Jiao needs to fix her car. However, she has an overwhelming impression that they have met before. Only then, does she realize that she has a year of life completely removed from her memory. Soon, it turns out that the key to her lost memories may be a ship's voyage. The same cruise she and Wu Yu met on. From then on, the couple tries to recreate the course of events from that time, which is even more difficult by the fact that Wu Yu himself has no recollection of time spent on the ship. However, the couple has good reasons to uncover the truth when it turns out that this tour is the key to discovering who murdered Wu Yu's sister. Soon, thanks to the ability to travel in time, both of them are not only trying to recover their memories and save the man's relative, but also to understand why they found themselves in this situation, in the first place.—MyDramaList