I'm not sure of what ive read, im not satisfied with the flow of the story at all, im sorr...

Which part have you not understand (=・ω・=) ? I might be able to explain a little bit

Well the thing is there are a lot of parts of the story not explained directly or at all;

what happened to real siwoon appearently he died because of the disease tho they never mentioned thoroughly plus why he told woojin that he is gonna die instead of himself?? There was a logical error or there was a mean behind his words????

What about the real siwon who wanted to die? We learnt about his story through his twins words tho he just switched bodies to die?? He would have died in his own body?? If the reason was getting revenge from the twin actually Taemin didn't care that much of waht happened to the owner of the body. The main focus of the story was reunite of Woojin and Taemin.

And the dream that Taemin saw before dying/switching bodies. How can a person see his exact dying way in his dream? Althougj switching bodies is also exceptional since this is a fiction let me say that im okay with the dream. But again why they switched bodies? That was totally meaningless for the story because nothing satisfyingly explained about this.

Appearently the writer wanted to use this theme and im sure that would work if she really gives the readers aim.

I'm a new manhwa reader in mangago and i try to read the most popular ones first yet this was the least satisfying story ive ever read here. Sorry ╥﹏╥

thank god im not the only one. I also read this because it is among the popular ones but the plot is just.. um not for me i guess

The real Min Siwoon was suffering from terminal illness, he is dying everyday due to his sickness. I think that's already self-explanatory as to how Woojin took the real son's position as heir, if the real Min Siwoon were to die then who would be the heir? The father of Min Siwoon of course had to find his other son to fulfill the role of the heir. The real Siwoon telling Woojin that he's gonna die once the real Siwon dies means he will take his place and pretend to be the real son, taking his name and his status in the family, it was a metaphor for killing Woojin's past self and bearing the name and responsbility of the real Min Siwoon whos destined to perish.

Moving on to Min Siwon, as you have read, his twin Min Jiwook has inferiority complex which lead to him harboring ill intents towards Min Siwon who was being favoured by everyone. He plans the gang torture to push his twin further down the dirt. Yoon Taemin dreaming about Min Siwon's suicide could be a premonition. Min Siwon wants to die, and Yoon Taemin wants to live. Min Siwon was in a coma for three months whilst for Yoon Taemin after his accident felt as though it was only a short while. The desire to die in Min Siwon is large as opposed to Yoon Taemin, and Yoon Taemin's body was already at the point of no return which then became the perfect vessel for the Min Siwon to reside in as his real body is fighting against death and the same thing goes for Yoon Taemin who still wants to live.

I hope this cleared things up somehow.

Thanks for the explanation it is much more explicit now, if i read this again, i will read it by considering your words surely

No problem! Glad this helped.