1) My guess is that student who is holding name tag is doctor, so the died doctor maybe Lee Myung Hyuk ? And no chance for Jun Seo Because Jun Seo is not the person become like doctor from what we saw in 6eps.....
2) Or Maybe Jin Seo is the doctor, they killed him or someone killed him ( third person ) after his death New doctor pretending as him.. here the killer of Jun Seo if Prosecutor or Rich Guy then, it's quite predictable twist... hoping the writer created another version of our theories like they're not the real murderers of Jun Seo and introducing doctor and killer maybe the plot twist...
3) and third person maybe is the " researcher who gives injection to the Wong soo in ep 6 " is the real doctor..
My guess
1) Lee Myung Hyuk ( dead ) 2) Jun Seo ( dead ) 3) Student that holding name tag 4) researcher friend who is working in that pharmaceutical company 5) A new character from school who wants to get revenge on Wong soo and prosecutor
And i don't think theres a traitor or mole JJK side, if there then it's same old element of thriller, since you're guessing about mole in the team or station then it may be the writer created that element for us for giving unpredictable plot twist.. And here the moves of JJK know only - his team, Yoon Jin & insurance guy.. We all suspecting everyone except Insurance guy 😁 only this type of characters can change the twists in thrillers, maybe he the helper of real doctor or original doctor....
I think he really is helping him and covering for him, but also, I don't like when someone thinks something predictable…
Shocking plot twist a bit predictable now i think We already got an idea who maybe the doctor from available characters.... But shocking twist maybe only - if the Doctor is the Noh ( the taxi driver who JJK went to find out ) ... My theory is disconnection right 🤣 !! Revealing doctor role is quite predictable but we want unpredictable ending !! Like JJK going deeper and deeper where there's no chance to going back... So expecting the ending will make more satisfying one which already given best endings Thrillers out there...
Or the doctor is the student who is holding A student tag 🫥😯
One of the high budget project in kdrama history 🤗😌
Yesterday i found update in this page D.O said Sculpture City will start filming this fall in his latest concert 💁🏻 !! You can check it down in comments
Going to South Korea on behalf of JCW and DO fandoms, to talk with director, Writer and production house release this drama in this October.... my bag is fully loaded with 🤗🔫🗡️🪚🔨🪛⛏️🔪
K-Drama 
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2) Or Maybe Jin Seo is the doctor, they killed him or someone killed him ( third person ) after his death New doctor pretending as him.. here the killer of Jun Seo if Prosecutor or Rich Guy then, it's quite predictable twist... hoping the writer created another version of our theories like they're not the real murderers of Jun Seo and introducing doctor and killer maybe the plot twist...
3) and third person maybe is the " researcher who gives injection to the Wong soo in ep 6 " is the real doctor..
My guess
1) Lee Myung Hyuk ( dead )
2) Jun Seo ( dead )
3) Student that holding name tag
4) researcher friend who is working in that pharmaceutical company
5) A new character from school who wants to get revenge on Wong soo and prosecutor
And i don't think theres a traitor or mole JJK side, if there then it's same old element of thriller, since you're guessing about mole in the team or station then it may be the writer created that element for us for giving unpredictable plot twist..
And here the moves of JJK know only - his team, Yoon Jin & insurance guy..
We all suspecting everyone except Insurance guy 😁 only this type of characters can change the twists in thrillers, maybe he the helper of real doctor or original doctor....
We already got an idea who maybe the doctor from available characters.... But shocking twist maybe only - if the Doctor is the Noh ( the taxi driver who JJK went to find out ) ... My theory is disconnection right 🤣 !! Revealing doctor role is quite predictable but we want unpredictable ending !! Like JJK going deeper and deeper where there's no chance to going back... So expecting the ending will make more satisfying one which already given best endings Thrillers out there...
Or the doctor is the student who is holding A student tag 🫥😯
D.O said Sculpture City will start filming this fall in his latest concert 💁🏻 !! You can check it down in comments
I hope this time we have chance to see helping characters of main lead without death word
Hero turned villian
Two concepts for two leads .. 😌🤗