Throughout this story it would probably have many meanings, so this is just one aspect of it . Theory revolves around Jin mainly.

THE FIRST THEORY:

  Maybe Jin's memories with the other 6 members who have not existed in the past.Maybe Jin and they do not coexist in space and time.Why is '' Exist '' and not 'living'? Because they may never have lived.  

  Multiple Personality Disorder (MPD) or newer name Dissociative Identity Disorder (DID), is a psychological disorder that produces multiple personality (at least two Each personality is created because of cognitive impairment due to the influence of each memory fragment of the past. Each personality has its own story.  

  In this hypothesis, Jin may be a person with multiple personality disorder who is in serious crisis. 

 "Kingdom of day and night, two different worlds come from two opposing poles, joined together in this moment".

  We can see in the pair posters that Bighit posted is the same pair of HYYH chain. Each image has one thing in common: the color contrast of the two halves. There is also a contrast between the two sentences in the individual poster of each member in a pair that are joined together and when two sentences are joined we can see an association. However, only Jin is always standing alone in both of Jin's pictures, both of which have the same structure as their desire to go back in time.

  JK> <SG: Someday I want to run to where my heart is headed,> <Do not come near, you will become unhappy 

 JH> <JM: Just shine, I will be alright> <I lied, there is no reason for people to love someone like me

RM> <TH: I'll just watch you from behind, because it's not time> If I make another choice, will not you leave me?

  It sounds like a tip, a struggle of consciousness. Maybe 6 members are 6 characters in a subject and that person is Jin. The story of each member is the reason for creating a personality of Jin. This may account for the fact that many of Jin's scenes are in the same spot as the other 6 but always see something they do not see, while the picture was taken together. Other members but only Jin finally appeared in the photo. It can also be explained that Jin is the witness of what happened to the rest of the members because Jin was the one who experienced the suffering, thus creating the reason for the formation of a new personality. . In addition, if remember in the SPRING DAY m. There is a scene Jin standing at the bottom of the stairs, alone up high, whether Jin is the person left behind, the key to hide the suffering to keep For the town always happy?

  "If I could go back in time, I would become the greatest man in the world." 

 "If I could go back in time, I want to return to that beautiful beach of summer."

 Do these two words sound like suicide words?In the picture of RM and TH we see SAVE ME and I'M FINE. This is a hidden message in the campaign against suicide.

  It is possible that Jin is a person with multiple personality disorder due to past traumatic injury and is in a severe depression, possibly with depression leading to suicide. The beautiful memories that Jin underwent was just an imagination to hold and hold the last hope. And is AWAKE whether it is a call to the province itself and out of the Appearance I AM, but inside is screaming TOGETHER. And another proof of this hypothesis is that in Jin's short film, all of the items in the short films of the members appear.  

  However, this hypothesis still has some unreasonable points, so we temporarily leave here.  

THE SECOND THEORY:

  Friends - the rest of the members and memories are real.But Jin exists in some space.Many theories suggest that Jin was dead. But it's also possible that Jin has not actually died. In a space of time, where JIn can travel through space-time from the future, from the past, but can not just return to the present. However, he did not know this and still saw himself enjoying the fun of his friends. But maybe Jin is seeing abnormalities, as I said above: some scenes Jin is in the same place with the other 6 but always sees something they do not see.In the concept photo of HYYH part 2, Jin is the only one who wears shoes on the grass, but in Wings, Jin is the only one who does not wear shoes. And in Spring Day, Jimin stands in front of the beach on the white shoes, the shoes that Jin in the picture concept HYYH part2 is also white. "If I could go back in time, I would go back to the beach this summer," "We are all lonely when we come back from the coast." "If I could turn back time I would become a man the best ".Have you ever thought about something here?  

  [ Just think here, think of going to write next ]