The neon lights of office buildings illuminate the rush of urbanites, but they also hide hidden thoughts. Department director Zhang Wenbo and project assistant Shi Shuang, who had been working for one year, quietly developed feelings that transcended workplace levels in the lights of overtime work late at night, the silence in the elevator, and the tacit understanding at work. He is a calm and restrained boss who hides his favoritism in professional guidance and silent care; she is a careful and tenacious subordinate who turns goodwill into hard work and quiet concern. The rules of the workplace are like invisible barriers. The opinions of others and future risks are all obstacles. The two are repeatedly pulled between their heart and reason. The warmth of a note, the companionship of a glass of lemonade, and the tacit understanding on the way home late at night have become the footnotes of this secret love. In the reinforced concrete urban jungle, can they break through the boundaries and let the seeds buried deep in their hearts bloom into the flowers of love under the neon lights?