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It is believed that back on April 19, Mr. Ahn murdered 'A' in their shared home because of their recent breakup and because he suspected that she already had a new boyfriend. Mr. Ahn attacked 'A' while she was sleeping and stabbed her nine times. After 'A' died due to blood loss, Mr. Ahn then attacked 'A's dog. Allegedly, he choked, stabbed, and hit the dog on the head multiple times with kitchen utensils. The dog passed away after Mr. Ahn put it in a washing machine.

Mr. Ahn and 'A' started living together back in October 2013. Reportedly, Mr. Ahn was the head of a prostitution business, while 'A' worked as one of its hostesses. The two began to have problems when 'A' started coming home late and Mr. Ahn harbored suspicions that she was meeting other men. Mr. Ahn threatened 'A' that he was going to tell her family about her work in the prostitution business and that he was going to kill her dog. Shortly thereafter, 'A' broke up with Mr. Ahn. On the day of her murder, Mr. Ahn looked through 'A's KakaoTalk messages and assumed that she had a new boyfriend. In his anger, he decided to brutally murder her and her pet.

The Department of Justice has commented, "As we pieced together that the victim was unable to resist in her sleeping state, the attacker stabbed her until she died, and that she must have been afraid and in pain, we believe there's a need to punishing [the accused] severely."