Responses
I wouldn't say he is in love with Jitae, but definitely feels sorry for him.
And as I see Jian was always treated like a piece of shit by Suryeon, Hajoon and the whole family. And the grandfather is just keeping him as a puppet until Jitae takes over the company, while Suryeon is using him as a tool to bring Jitae down.
So he is definitely torn,and has mental problems, that's why the drugs and sexual stuff.
Tbh I expexted Jin to protect him, but I don't know what I expected after he literally left Jian there with Hajoon several times to suffer.
I bet Jian is in love with Jitae or he feels guilty because of his mother's involvement in Jitae's mother's death and Jian's plan leads to his own sacrifice or dying, we can see in all the chapters how he's so self destructive and Jin saying "you can't die" makes sense in this scenario.
Imo that's why he wants him to hurt Jian to the point he can't even look at him, also the line "you don't know do you? You probably shouldn't" further convinces me. I don't think it's resentment or betrayal.
I didn't expect Jin to be reddest flag among the main characters, Jian should probably fire him and run away lmao
(It's probably a spoiler)
The author said on twitter that Jin x Jian will have a happy ending, or atleast implied it when she said it reminds her of the song Happy ending by IU