During VLIVE sometimes JK likes to watching his phone. I think he is watching their VLIVE through the phone. Especially when he is in position when he cant see Jin properly. That's why he is watching Jin through his phone. Many proofs about this are in the other BTS LIVE because it happens many time. And we can see him keep staring at his phone, but when Jin suddenly move his head to check on him, he also move remove his stare from his phone. He can see Jin's act through the phone 💜
it is interesting how differently we can see the same situation. Jin did not touch JK at all... though JK was leaning on Jin's knee.... when JK touched Jin's shirt, he raised up his hand to stop it.... when JK was hugging both RM and Jin's shoulder and JK looked at Jin, he did not look at JK.... you are right sometimes Jin looked at JK, but the whole situation was rather " awkward " for all of them... I had a feeling that they had an argument earlier... I did not understand why JK removed his hands from RM and Jin's shoulder when RM touched Jimin's shoulder :) JK face was disappointed 5:07 then he started to strech his hands.... I did not like the whole Vlive, because it was rather a forced talk in front of the camera, then their own decision... life goes on.... 💜💜💜
I honestly think it was because Jin and Tae were making constant eye contact the whole vlive. I don’t know who you may believe might be involved with each other, but I think this interaction is what made JK upset.