Honestly, with Jin-woo's narration throughout the whole drama I am amused how nobody expected this kind of ending. I feel like it was pretty much foreshadowing it because he was always reffering to the past. Did nobody even question who he was talking to? Because I was and I currently believe he told it to himself to pass time.
This is how I understood the ending: Se-ju wasn't a bug because he was initially protected by Emma, Emma created Marco the bug in the first place and when Jin-woo killed Dr. Cha, they both became bugs, because before the problem was solved, one killed and one died. Emma deleted Marco, that's why Se-ju was able to come back. She was supposed to be the only one to use the key because she was the only one to know how it works. Since Jin-woo discovered the solution, he took it upon himself to delete them since they were all directly connected to him and basically died because of him, it was a way to say goodbye. He let Emma delete him, but since he was the Master he created (probably unknowingly) the instance dungeon, making him invisible and trapping him in the game world. However, he is not hiding from any enemies like Se-ju was, so he is just invisible to people that don't play the game and game enemies. My guess is, that they either figure out how to unlock the instance dungeon or that another player has to conquer the next quest to become the new Master and therefore "removing" Jin-woo from that position, automatically dissolving the instance dungeon. That could be why Jin-woo is helping other players to level up. (Though I gotta admit, I am not sure how killing NPCs for someone else helps them to level up because before he did it to level up himself.)
I think the ending is perfectly fine. It would've been so weird to have an absolute happy ending, considering how action packed it was. With so much anxiety throughout the whole drama, this is a bitter sweet ending. A last scene of Hee-ju and Jin-woo locking eyes would've been nice but well, it's okay. Hee-ju would've been only crying anyways.
as sad as I am about the death ... I just gotta say that actually killing off characters in an highly dangerous plot is such a good storytelling tool bc it raises the stakes, the feelings and it brings a bit of realism into any kind of fantasy situation.
Se-ju wasn't a bug because he was initially protected by Emma, Emma created Marco the bug in the first place and when Jin-woo killed Dr. Cha, they both became bugs, because before the problem was solved, one killed and one died.
Emma deleted Marco, that's why Se-ju was able to come back. She was supposed to be the only one to use the key because she was the only one to know how it works. Since Jin-woo discovered the solution, he took it upon himself to delete them since they were all directly connected to him and basically died because of him, it was a way to say goodbye.
He let Emma delete him, but since he was the Master he created (probably unknowingly) the instance dungeon, making him invisible and trapping him in the game world. However, he is not hiding from any enemies like Se-ju was, so he is just invisible to people that don't play the game and game enemies.
My guess is, that they either figure out how to unlock the instance dungeon or that another player has to conquer the next quest to become the new Master and therefore "removing" Jin-woo from that position, automatically dissolving the instance dungeon. That could be why Jin-woo is helping other players to level up. (Though I gotta admit, I am not sure how killing NPCs for someone else helps them to level up because before he did it to level up himself.)
I think the ending is perfectly fine. It would've been so weird to have an absolute happy ending, considering how action packed it was. With so much anxiety throughout the whole drama, this is a bitter sweet ending.
A last scene of Hee-ju and Jin-woo locking eyes would've been nice but well, it's okay. Hee-ju would've been only crying anyways.