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His wife was also subject for experiment but she got HIV got kicked out, later episodes may reveal it.

So there 2 "Choi Se Kyeong" one with short hair and one with long, short version may be travelling too. In trailer we can see long hair version CHOI se kyeong. But I am more inclined , or doubt that there may be a daughter. Both looks same.

Im telling again Seo Hye Eun is mastermind of all this she is the killer. She taking revenge on everyone

Hye Eun is the mastermind is taking revenge on everyone including his husband , she is psychopath . She doesn't care for her child . Why did she have to take revenge on the husband ? Guess Hye Eun and her husband have something in common, use the brain make the connection . Hye Eun is also intelligent ,she also got experimented as a child. She only wanted the money and her husband should take the fall for the murder,but everything went wrong.Now the murder suspect shifted to the man who slited HIV knife on Hye Eun. The man(HIV Knife) paid for Hye Eun daughter hospital fees. Hye Eun uses his kindness of this man(Hiv knife),makes him the murder suspect.But here comes the Smart kid she foils and exposes Hye Eun plan. Hye Eun taking revenge on husband because Hye Eun was never meant to be adopted, but her husband was meant to be adopted ,but she got adopted got experimented Got HIV got kicked from family she suffered as a child.