Seol Ok, who dreams of becoming a detective, has become a mentor for a new police chief, but must hide it from her nosy mother-in-law, who believes she's having an affair.
Detective Ha Wan Seung's arrest of gang boss Jang Do Jang backfires when a lawyer brings his methods into question. Seol Ok's startling experience doesn't stop her investigating.
The Violent Crime Unit is transferred to Robbery-Homicide, but Detective Ha refuses to stop going after Jang Do Jang. Seol Ok tackles a mystery in her house instead of on the streets.
Detective Ha is about to be reinstated at Seodong, but worries that Seol Ok's testimony will put her in danger. Ho Chul orders Jang Do Jang be released again.
Detective Ha and his team are excited to be part of a special unit, but realize their expectations were too high. Seol Ok is spurred into action by Joo Hyun's death.
Seol Ok is excited to celebrate her wedding anniversary, but finds out that a case she turns down involves her mother-in-law. Jung Sang Won goes behind his sister's back to CEO Ha.