A middle-aged man time travels to the past to become a teacher to his 17-year-old classmates. Hao Hui Gui is a 36-year-old high school teacher who is still single. During a gathering, he gets into a huge disagreement with everyone present and even gets into a fistfight with his best friend. Upon returning home, he mindlessly flips through his personal diary from 20 years ago and starts to recall many memories from the past. He falls asleep eventually and meets with his younger self in his dreams.
Bai Yin Qi is the King of Sumeru. He is handsome and intelligent, but his strengths are of no use in an imperial court controlled by corrupt officials. Assassins come and go, but one day, he falls in love with female assassin Yu Yan. Because of another assassination attempt wherein his loyal guard Tian Xiao Li risks his life to save the King along with a mysterious pocket watch, the three time travel to the year 2018. Bai Yin Qi assumes the identity of the sole successor of the powerful Bai Group. Yet he faces danger on all fronts due to his background as an illegitimate child. When he meets Yu Yan in the present day, he realizes that she no longer remembers him.
Xu Wei, an actress in mainland China, starred in the TV series " I am waiting for you in the future " in March 2018 ; In July of the same year, starring in the light-sounding drama " The Assassin Girlfriend " plays the modern girl Bai Zhu.