Responses
No, he left the mansion in shock and unsure to do with the strange emotions he was feeling, hence why he went the FSB headquarters. It was only once he realized that the mansion was being attacked did he come flying back in a helicopter to fight the attackers (FSB team), and find Taekjoo who was on the literal brink of death.

Looking like a pregnancy dream JSJSJSJS
Btw, I remember in the novel, it wasn't like this? Didn't Zenya stayed with taekjoo till he breathed? I remember Zenya was scared shitless while waiting for taekjoo to open his eyes, no?