You have a right. There is another discussion about the timelines in the drama. You can read about it. I try make it simple for myself, because it's too complicated if it a few timelines :)
I am not sure about that. Luna will be with Shin Jae in Kingdom of Corea, because everything and everyone have…
Tea Eul and Shin Jae will save the younger version of Lee Gon. Maybe Tea Eul will be born as Luna? When the time will be changing Lee Gon this time won't be able say goodbye to Tea Eul, because in that time she will be in his world. So, he won't give her a flowers this time.
He can come back in time only when the flute is complete. That is until the coup in 1994. Traveling between 1994 and 2020 happens only because the flute is not complete and he must cross the gate some many time that he could be again in 2020.
Not quite. This event changed a little, because Lee Gon visited Tea Eul twice in her past (when she was 5 and 27 years old). He doesn't know it because it will happen in his future - that's why he is confused by her reaction.
The story is not so complicated at all. There is only past and present. To restore the balance, Lee Gon must travel to the past and kill Lee Lim so that he can't go to a parallel world. Then the future will change. Simple ;)
I think the scars are people that travelled between both versions and the location is wherever their other version…
I think they appears on the people who killed their doppelganger or on those who no longer have him in the other world because he/ she died. I'm not the type of scientist but I think it has to do something with the matter. Scars are a sign of her disturbance. When a given object "human" dies in a one world, its energy disappears. It is possible that this causes some disturbance if a person moves between both worlds, and doesn't have her/his counterpart.
Am I the only one thinking that Luna may not be sick at all? When she took her wig off in ep 11 her hair looked…
If someone is sick and has a cancer, this does not mean that their hair will fall out soon (of course sometimes it could be a sign of illness). They fall out only if a person undergoes chemotherapy, it destroys the whole body and causes hair weakness.
He travels in time. Tae Eul already knows what will happen. Lee Gon doesn't know it yet, because it will happens…
Yes, it was future him. She knows it because this outfit has not been sewn yet and she saw it. And I think in that episode she clearly said that this is not the LG she knew.