Special Force Squadron leader and overseas dispatch team leader Yoo Sijin (played by Song Joong Ki) and Sergeant Seo Dayong (played by Jin Jiu) were enjoying their vacation. When they were shooting toy guns in a street shooting shop, they heard someone calling for a thief. Seeing that the thief’s escape route was in his direction, Xu Dayong handed the model gun used by the game store owner (played by Lee Kwang-soo) to the U.S. Delta Force’s desert to Yoo Sijin’s hands. When the thief reached an effective range, the two took it from Shot down on the stolen motorcycle.

The thief fell to the ground, and the owner of the motorcycle refused to call the police in order to avoid trouble. Xu Darong had to call the emergency center. In order to reflect social justice, Liu Shizhen asked two dolls from the owner of the shooting shop. He simply bandaged the thief and wrote “motorcycles” on his arm with a pen. Accident, suspected rib fracture”.

The shooting shop owner forced the two dolls to Liu Shizhen and Xu Dayong, and asked them not to visit the shop again. When the two of them were resting in the drink shop, Liu Shizhen mocked Xu Dayong for being so soft-hearted, not like someone who had been a gangster. Xu Darong was worried about the thief’s injury. Liu Shizhen analyzed the thief’s actions when he fell off the motorcycle and analyzed that he had practiced Kung Fu, and there should be nothing wrong with him.

Xu Darong’s ex-girlfriend, Yin Mingzhu (Jin Zhiyuan), called Liu Shizhen. In order to prevent him from answering the phone, Xu Darong quickly promised to introduce him to the stewardess. Liu Shizhen asked for a photo of the stewardess. Xu Darong rummaged all over his body but couldn’t find the phone. Recalling the thief’s unusual behavior during bandaging, they suspected that the phone was stolen by him.

The thief was taken to Haixing Hospital. When he went to the emergency room, Xu Darong’s mobile phone slipped from his trouser pocket to the ground. The staff picked up the phone and handed it to Nurse Cui, just in time for Yin Mingzhu’s call. Nurse Cui thought the thief was the owner of the phone and told Yin Mingzhu that the owner of the phone had a motorcycle accident.

Surgeon Jiang Muyan was in charge of seeing the thief, and after arranging nurse Cui to take him to film, he was called away by the surgeon. Because it takes a while to make the film, Nurse Cui returned the phone to the thief and left. The thief received a call from his companion and told him to pick him up quickly.

Jiang Muyan, who was talking with the chief surgeon, found the escaped thief patient and took him back to the emergency room. The thief refused to be treated for fear of being caught by the underworld brothers. Nurse He used the police as an excuse to let the thief receive treatment. The thief had an excuse to go to the toilet, escorted the phone to Jiang Muyan and then slipped away.

Liu Shizhen and Xu Darong drove to Haixing Hospital and found Jiang Muyan for a mobile phone. Jiang Muyan thought the two were the underworld elder brothers in the thief’s mouth, and when he discovered that the thief had escaped again, he drove them aside. There are things in the phone that are important to Xu Dayong, so we must recover them. Liu Shizhen fell in love with Jiang Muyan at first sight and quickly pretended to be sick to reject Xu Dayong, but was easily dismantled.

The two rushed to the hospital and saw that the thief was being beaten by the underworld. The bloodied thief asked Xu Darong for help. Knowing that the thief wanted to leave the organization and could not pay the 5 million won retirement fee, Xu Darong decided to help, and the eldest brother who claimed to be the thief, rescued him together with Yoo Sijin.

Yin Mingzhu came to the emergency room to look for Xu Darong and found that the attending physician was his senior Jiang Muyan. Because he was brooding about Yin Mingzhu’s taking away his secret crush during the internship, Jiang Muyan ridiculed Yin Mingzhu and left. Jiang Muyan learns from a friend that Yin Mingzhu’s boyfriend is a soldier, but it is a pity that he is separated because of the wrong door.

Liu Shizhen and Xu Darong helped the thief named Jin Qifan back to the emergency room, but they saw Yin Mingzhu standing in the corridor. Seeing that Jin Qifan’s injury was more serious than before, Jiang Muyan refused to believe Liu Shizhen’s explanation anyway, and asked Nurse Cui to contact the security guard for monitoring, and he took out his mobile phone to call the police. In order to prove his innocence, Liu Shizhen suggested that Jiang Muyan ask Yin Mingzhu for verification.

Yin Mingzhu asked Xu Darong why he didn’t answer the phone. Xu Darong said that he had changed his mind and was unable to explain. Xu Darong’s lukewarm attitude angered Yin Mingzhu, and ordered him to stand in salute with the rank of lieutenant. Fortunately, Liu Shizhen and Jiang Muyan arrived in time to help Xu Darong get out of the siege, Yin Mingzhu. Leave angrily.

Xu Darong told Jin Qifan that he had been in Judo until his second year of high school, so he could tell that he had learned kungfu by his posture when he was beaten. Jin Qifan said that he had studied Taekwondo and won a gold medal. Xu Darong told Nurse He that he was a family member of Jin Qifan and helped him go through the hospitalization procedures.

In the surveillance video, Liu Shizhen tidied up the gangsters and watched Jiang Muyan applaud again and again. Because of the fierce fighting, the old wound on Liu Shizhen’s abdomen was torn, and Jiang Muyan hurriedly treated it and suture it. During the treatment, the two talked very happily, and they agreed to come back for disinfection at 2 pm the next day.

Xu Darong and Liu Shizhen came to Haixing Hospital together and paid for Jin Qifan’s discharge. Jin Qifan asked about a way to leave the underworld, Xu Darong told him that he had fled to a place that he could never catch.

When Liu Shizhen was strolling around, he saw Jiang Moyan who was receiving a patient, covered in blood, and helped push the bed into the operating room. After the operation was completed at 18:04, Liu Shizhen had left the hospital. Jiang Muyan called Liu Shizhen, and Liu Shizhen asked her to come out to meet him now.

While waiting for Jiang Moyan in the hospital lobby, Liu Shizhen saw news on the big screen reporting the kidnapping of two UN staff members. Just waiting to take a closer look, they received a call from the army. Liu Shizhen immediately took the elevator to the top of the building, and happened to miss Jiang Muyan who had come down from another elevator. Jiang Muyan rushed to the roof again and saw the helicopter coming to pick up Liu Shizhen. Liu Shizhen and Jiang Moyan agreed to meet next weekend and go to the movies together.

On the military plane, Liu Sijin asked about Xu Dayong’s flight time. After learning that it was seven hours later, several veterans unanimously took off the general badge. The Harry Potter corporal Kong Cheho didn’t understand the reason. Liu Sijin told him. If you die in battle, you can’t leave your identity. Before leaving the plane, Kong Che-ho asked about the destination of the trip, and Yoo Sijin told him that it was Afghanistan.