A female judge encounters an old teacher who uses the letter of the law to his own advantage while she wields it as a weapon to protect those in need.

Zuo Lin (Lv Jiarong) is a judge serving at the people's court in Mingzhou. While dealing with a real estate case in Yongjia, she butts heads with an unexpected opponent. He is Zheng Huaishan (Tan Kai), an old university teacher and a dear friend whom she hasn't seen in a long time. However, investigations lead them further astray and Zuo Lin has to make the choice of overcoming her personal feelings to uphold justice.

左琳是明州市人民法院特别执行处的一名女执行法官，在执行永嘉地产案时碰上的对手却是多年未见的大学老师郑怀山， 他也是她大学时代的梦中情人。一个女人把法律当武器，一个男人拿法律当凶器，于是两人之间展开了一场漫长的情与法、正义与邪恶的对抗。永嘉地产是市政府重点工程项目，本应 盈利，却出现巨额亏损，负债累累，导致法院判决赔偿无法执行。而这笔钱实际上被郑怀山暗中挪用，以拯救发展失衡的“横山系”公司。左琳则以追索永嘉地产的资金去向为突破口， 开始了漫长的执行之路。从永嘉地产追到荣达信托，再追到富康咨询、重泰机械，左琳仿佛陷入了一张无形的大网中，一步步落入郑怀山设计好的法律陷阱，一次次陷入执行死局。尽 管左琳遇到各种威逼利用，但最终正义战胜情感，亲手将自己的老师郑怀山送入监狱，捍卫了法律的公正。