my father was an investigator. …but he was murdered 15 years ago. learning the truth, i became an investigator to avenge my father's regret and chased after the criminal. eventually, i married a husband who was also an investigator, and soon after, i found out i was pregnant. but i didn't intend to quit my job halfway through. however, just before giving birth, my husband died in the line of duty. …i'm the only one who can protect this child… i retired from being an investigator and gave birth. i chose a peaceful life with my beloved daughter, who is a memento of my husband. in the midst of all this, i heard information about the case…