Move in day

Little sister left behind; And her big chance to be w/ML as whatever he assigns her to do -- or rather his side kick. I've seen ML in another drama, haven't put my finger on it, yet, but I'll know soon again. Her best friend investigator is still searching for her master. So far he's bought meds from someone and he's still alive. They've arrest a wife abuser. Abuser is from one of the 4-great families in this county. They are both follow the trail of her death/his wife.

Investigations

Everyone is looking for clues on everyone else and we're getting nowhere even though his hair is getting greyer all the time.

4 powerful evil clans appear.

Solving cases. Facing powerful people. And the two hearts distrust each other and try to understand each other. Bringing justice to Heyan City. But who committed the crime against my life?