THRESHOLD follows a sister, claiming to be cursed, as she persuades her brother to embark on a cross country road trip to break her spell.。讲述江城市首富程睿为查明公益基金出现黑洞的幕后真相，化身外卖员，卧底在为学校输送餐食的“干饭人”餐厅，在调查过程中，与餐厅女老板郝佳美日久生情，开启了一段充满治愈又欢乐满分的爱情故事。。