So after some discussions with my sister, here is the story that I thought might be happened in Missing MV.
It was such a nice time long time ago, when Minsoo, the girl and Byunghun still together as friends. Minsoo and the girl decided to date each other until this time happened when Minsoo gone wild. Clubbing, get drunk, sleeping with other girl. It made the girl frustrated and angry toward Minsoo. With all the force that Minsoo could do to make his girl not mad at him again. At this rate I think he did some violent to her like slap or anything to make her shut her mouth and actions, that’s why the girl crying and hiding. At this time Byunghun came as someone that the girl can hold onto.
Several times after that, Minsoo realized he never can continue without her and trying to reconcile but she was never want to meet him. He went back to his room, he was trying to call her, but no answer. He sunk himself into darkness, drugged himself because of her and also to the fact that it is not him that being on the girl side but Byunghun, his bestfriend. He drew a rose and broke the glass. And because the overdose of the drug he killed himself (with the broken mirror?).
I thought because there is a red stain at the back of the girl’s white shirt and how frantic she was when she back at her room banging the door, searching for Byunghun.
She told him, Minsoo died. Because of her. It would be different if she is willing to answer every call Minsoo made, he might still be alive. Byunghun tried to calmed her, washing her away from the stain when slowly he realized whether if it was his mistake that he didn’t suggest the girl to forgive Minsoo. His egotism took away his bestfriend and there is no turning back. He cried. They cried.
About the kiss… maybe because the girl just too confused about her own feeling after knowing she lost her boy and at the same time there is another boy that giving her love.
And that’s it.
LMAO mind my wild imagination and rubbish english. Good night.