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First of all that shirtless (?) reflection is not Lee know! :
Hmm
The pants belongs to jisung .. and the anime feet too. Well it is Han Jisung. 
That built 
That built
But how can he went back to the dorm that fast?!? And I'm pretty sure they're sharing clothes so.. MEORII APPEUDDAAAA
I won't stop aghh just reveal it 
Last analysis: jisung ended the live at 4:00 pm kst Lee know sent the pic at 4:40 pm kst . Han Jisung can exactly go home for 30 mins ig. And the fact that Lee know made it , he'll probably rushed home because of it. 
Final guess it's Han Jisung!
Final guess it's Han Jisung!
Wait 5:00 pm kst and 5:40 pm kst I mean (Confused because of timezones) but still the duration is 40 mins. and what if Jisung suddenly end his live because of that. Okay bye! 
.....
