Actually what I like the most is Yoon Gyun Sang's expressions when he kissed her. You can feel how desperate he was and the "you're the only one" and with that ost, I was dead lol
The kiss scene in the cabinet was bad. It should had been short and intense like he might never see her again and he was short in time (he activated the watch). There were no feelings in that kiss and it was too long ...