Why did the last person in the movie "Yellow Sea" go to the bank to see the bank clerk and leave at a glance? What does this paragraph mean?

It was the bank clerk who bought the murder because he was having an affair with the professor's wife.

In order to let his wife work in Korea, Jiu Nan (Ha Jung Woo), a taxi driver, borrowed a huge sum of 60,000 yuan. There has been no news of his wife for six months. Jiu Nan can only use alcohol and gambling to numb his nerves every day. One day, under the introduction of creditors, Jiu Nan met Mr. Mian (Jin Yunshi).

Mr. Mian is not only willing to help him sneak into Korea to find a wife, but also willing to pay off all debts on condition that he kills a person in Seoul. After many twists and turns, Jiu Nan finally crossed the vast Yellow Sea and arrived in Seoul. However, it is not easy to kill this tightly protected object. Jiu Nan began to make careful plans and began to inquire about his wife's whereabouts everywhere.

His wife seems to have disappeared from the world, but Jiu Nan, who didn't kill anyone, became a suspect wanted by the police because she appeared at the scene of the murder. At this time, Mr. Mian, who came from Yanbian, tried his best to kill Jiu Nan, who was almost desperate, for fear that the murder case would be exposed.

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Compared with The Chaser, The Yellow Sea has more realistic connotation and even a distinct documentary style. Behind those violent pictures is the director's reflection on his own nation. The strong realistic style of the film and the torture of facing life are impressive. The film's plot is ups and downs, the rhythm is compact but not messy, the violent scene of blood and blood, and the "chase+rollover" scene shot by 13 camera from multiple angles are full of popularity.

Jin Yunshi and Ha Jung Woo face each other very nervously. However, the performance of the special group "Korean China people" in the film is not positive. Although they belong to the same nation as Koreans, they are hard to be accepted by mainstream Korean society and become synonymous with "barbarism and vulgarity".