Shangsi Shi Qian Nanyou De Gege

Qu Qi went out with Tang Xia in college, but they broke up years ago. Now starting at a new job, she finds out her new boss is Tang Xi, her ex's older brother. The situation and the way Tang Xi treats her is all very awkward, and Tang Xi even confesses to her. What's worse is that she seems to be developing feelings for Tang Xi, too.

Tang Xi had fallen in love with Qu Qi at first sight, but he had to keep his feelings hidden when she became his brother's girlfriend. Until they met once again. This time, he'll take advantage of the opportunity and won't let her go so easily.

(Source: Bilibili, translated)