Responses
The FSB wanted Zhenya to kill Takejoo for the longest time and since they finally figured out that it aint happening they sent him on a suicide mission while they infiltrate his mansion to take Anastasia for themselves. Zhenya only agreed to do it so they would get off his ass about handing Taekjoo and Anastasia over.

Firstly... The regret on Zhenya's face.
The way he's so confused why he's still annoyed after, but our robot has been devoid of emotions for so long he doesn't understand that Taekjoo saying he'd rather die than stay there hurt him. It wasn't anger, it was rejection and he cannot label the emotion.
But also, I'm so confused by the other stuff? Hes just.... Gunna work for the other guys now? Huh?