He began supporting the unknowing Jae - chan in his investigations and gives him helpful advice .
He once worked for ex-prosecutor Yoo - beom , though he was unaware of Yoo - beom 's fraudulent schemes until when he began working for Jae - chan .
He began supporting the unknowing Jae - chan in his investigations and gives Yoo - beom helpful advice .
He once worked for ex-prosecutor Yoo - beom , though he was unaware of Yoo - beom 's fraudulent schemes until when he began working for Jae - chan .