Alchemy of Souls Season 2: Light and Shadow begin three years where season 1 left off Jang UK uses the ice stone that brought him back to life to kill souls shifters, and Naksu who was believed to be dead came back and was rescued and was living in Jin Bu Yeon body when no memory of who she once was our leads meets again because of soul shifting a soul shifter when into Jinyowon and Jang UK went after it and met Jin Bu Yeon in Jinyowon with no idea that she was Naksu and Naksu met Jang UK with no recall of who he was and they created a pact and so begins they Marriage of Convenience.

P.S. I did not state what their pact was, so if you are curious, you will have to watch ?