Hey, I think I have some ideas for Season 2 because I don't want it only ends in Season 1. It was very good to focus only in the person of Yoon Ji-Woo. So her external life like family member, etc was unexposed and it will be very good to start Season 2 from there.
It can start where Yoon Ji-Woo is a college student with fake identity organized by Cha Gi-Ho. She may be on secret mission to uncover the drug crime in the college or any crime case. Or she only continues her normal life to overcome the past but suddenly should deal with cases. The revelation of the solved cases can direct to Yoon Ji-Woo personal life once again.
Or, it should not start with Yoon Ji-Woo as the main character, and I will like to discuss it later.
Nevertheless, Season 1 has very good ending.