Emma and David have been married for 7 years and take care of two children together. Although their life is dull, they are still happy. However, David feels that Emma seems to be always worried. To celebrate their wedding anniversary, the two agreed to meet at the hotel. Emma attended in a gorgeous dress, but David was late because of traffic jam. Bob saw Emma drinking alone and came to chat with her. The two tried to test each other. Emma claimed that her name was Alice and she worked in a financial company. When David arrived, he found that his wife was talking happily with a strange man, so he pretended not to know her and went over. After drinking, they went back to their rooms. After David fell asleep, Emma left a note saying that she was going to buy medicine and came to Bob's room. It turned out that Bob approached Emma this time for a clear purpose. They were all members of the killer organization. Emma hesitated because of her family and didn't want to be a hired killer anymore. She loved her family deeply. However, Bob hoped that they could cooperate. In a hurry, Emma killed Bob to save herself. The next day, Emma left home claiming to be on a business trip. As the police investigated the hotel murder, David had to be investigated. The police and David explained his wife's true identity. David also found a box containing his wife's secrets at home. David loved Emma deeply, and he hoped that they could face everything together. He went to Germany alone, hoping to learn the truth. Emma hoped that the whole family could change their identities and live in another country, so as to get rid of the pursuit of the police and the organization, but unexpectedly the organization had found them. After a fight, the couple was taken away by the organization. After Emma woke up, she found that her whole family had been captured. Her adoptive mother hoped that she would abandon the roles of "wife" and "mother", continue to be a killer, and kill David herself to end it all. Emma pretended to agree, and finally took David to kill and rescue the two children, and finally the family was reunited.