The heroine Zhao Jing'an has just returned to China and joined a state-owned enterprise. Unexpectedly, her direct boss is her old lover from college, Li Junxian. Also returning from abroad with Zhao Jing'an is her current boyfriend Tao Ran. The two have reached the point of discussing marriage, but Tao Ran doesn't know about the past events between Zhao Jing'an and Li Junxian during their college days.
Li Junxian has been developing in China since graduating from college, but his private life is very corrupt. With his handsomeness and rich wealth, he beckons to all kinds of women, but he can also live among thousands of flowers without touching a leaf.
But the return of his first love girlfriend Zhao Jing'an broke his inner peace. Looking at Zhao Jing'an's ordinary but happy life every day, his inner imbalance or reluctance to let go of the past friendship occupied his heart again.
During this period, the male and female partners also made their own calculations to see who was in whose eyes in the end.