My theory is: Gong Ji Chul survived the head shot (i dont know how), since he will be hanged afterwards. Then he is saved by his dad (we see that he wakes up in the morgue. He sets off to see Jung Ha Eun. She also survived the day in the snowy mountain. (They have said that in the last Episodes)We may see what happens when he visits her in the hospital in the next few episodes... :) i love this Drama very much..
He said: sun ah come with me? what do you think?