Sang Mu has worked at his girlfriend Xia Wei's company for five years, being the top sales champion for three consecutive years, only to receive a 50% discount coupon for Mid-Autumn Festival mooncakes. At the celebration banquet, he stumbles upon the truth: the grand prize was swapped, and Xia Wei is even taking newcomer Lin Xingling back to her hometown to pose as a couple to deal with her family. Heartbroken and done, Sang Mu submits his resignation, returns home to marry his childhood sweetheart Zhou Yue, and jumps ship to a new company holding major client resources. Losing both her career and love, Xia Wei comes to her senses and tries to make amends, but it is too late. Breaking free from the old relationship that consumed him, Sang Mu welcomes a fulfilling life of his own.