Jian Sijia, an ordinary coffee shop clerk, takes over for her best friend and meets Sunshine fitness instructor Darsis. The two go from "coffee stain bonding" to "accidental encounter in fitness class" and develop a two-way secret love in daily trivial matters. The female protagonist habitually avoids intimate relationships due to the lack of love in her family of origin. The male protagonist uses gentle persistence to break her psychological defenses. The process is interspersed with workplace misunderstandings, the female protagonist's younger brother is seriously ill, and the male protagonist's ex-girlfriend clarifies and other strong conflicts. Finally, under the New Year's Eve fireworks, the female protagonist takes the initiative to hand over customized coffee latte art (with "I do" hidden), completing a two-way healing love. The whole drama uses "ambiguity first and then straightness" as the refreshing point, highlighting the emotional impact of "being firmly chosen".
