In a tragedy at a construction site, the unexpected collapse of a tower crane triggered a justice battle to pursue the truth.Faced with the lies spun by the responsible party, the newly appointed audit team leader Shin Ci Young (played by Shin Ha Kyun) stepped forward and vowed to expose corruption, restore the truth, and let the responsible persons accept legal sanctions.

Shin Ciying, the new audit team leader, with the belief of impartiality and selflessness, is determined to eradicate the corruption within JU Construction Company.The company, shrouded in corruption and dishonesty, was mired in a power struggle between president and vice president.In order to strengthen the company's internal supervision, Chairman Huang Shixiong (played by Zheng Manzhi) specially hired external expert Shin Ciying.This decision caused quite a stir within the audit team, especially the gentle and approachable Gu Hanzhu (played by Lee Jung Ha) who was surprised by this.Shin Ciying directly points out the problems of team members with a stern attitude, and his iron-fisted style makes people difficult to approach.However, Yin Ruizhen (played by Zhao Yara) remained unmoved. She always focused on her responsibilities.

After Shen Ciying took office, he quickly reformed the audit team and ordered a re-investigation of the tower crane accident.Although the official report blamed the accident on the weather, Shin Ciying found something fishy.He led Han Su to interview Squad Leader Pei, trying to uncover the truth of the accident.However, Squad Leader Pei fled in a hurry with key evidence - a laptop, and even jumped from the third floor to evade pursuit.Han Soo was confused by Squad Leader Pei's behavior, but still chose to believe him.But when Shin Ci Young is attacked by gangsters in the street trying to snatch the laptop, Han Soo's doubts begin to deepen.

After the evidence was stolen, Shen Ciying clashed with Executive Xu, accusing him of interfering in the investigation.As the plot progresses, the man behind the scenes gradually emerges - Vice Chairman Huang Daxiong (played by Jin Gu).As the half-brother of Chairman Huang, he has always been an unstable factor in the family.During the period when the eldest brother was seriously ill, the battle for promotion between the brothers intensified within the company.Executive Xu stood firmly on Daxiong's side, making Daxiong feel threatened by Shin Ciying's investigation and tried to fire him.

However, fate seems to be on the side of justice.It turns out that the laptop was not lost, but was cleverly hidden by Han Su.He used his hacking skills to crack the code and uncovered bribery contracts between tower crane suppliers.Although Han Zhu had reservations about Shen Ciying's radical approach, in the face of conclusive evidence, he finally chose to trust Shen Ciying and returned the laptop to him.However, unfortunately, Han Su was intercepted by Nobita in the office.The vice president snatched the laptop before Shin Ci Young, adding suspense to the following plot.