Byeong-ho was called to the military, a war has struck and they needed all the help they could possibly get. Byeong-ho was a good sergeant, so people often favored him

he was now packing the things he needed, while you cried, almost begging him not to go. You were pregnant, so you were even more emotional. Byeong-ho looked at you, a saddened look on his face as he went to the front door

"love, promise me this. if i dont come back, promise me youll find someone else"

he says, a serious look on his face as he placed his hands on your shoulders. he didnt want you to stay alone forever if he didnt.. survive