zheng hao (played by nie yuan), director of the risk control bureau of lingshui district taxation bureau of xindong city, used big data technology to repeatedly solve major cases and was transferred to the inspection bureau as the head of the second inspection section; his ex-girlfriend liang jinqiu (played by yang rong), returned to china to develop his career at this time after working in a foreign country for many years; and he and the two of them were called "high iq iron triangle" during their college years.