The editing in the last two episodes was horrible; so choppy and confusing.
I'm guessing that when she kissed Jian Zi, she slipped him something to unlock his handcuffs with like she did when she said goodbye to him before he was put on the boat in an earlier episode. Seemed like a call-back moment to me.
Li Yong Ji obviously still had enough pull with someone to get them to sabotage the car, or at least that is what the cut to him in jail seemed to imply to me.
Since there will be no season 2, in my mind I'm going to say that the hoodie-person at the end was Jian Zi, coming back for his girl after she has publicly mourned him for a long enough period of time that everyone was convinced he really died. She'll be mad, but he'll say it's only fair because he mourned her fake death too. Then they live happily ever after, with lots of kids, now combining the lineage from his dad and her mom. Oh fate.