Given the sentence "A man with a pencil behind his ear and a guy drinking out of a mug have a conversation in a living room." is it true that "The man with the pencil is sitting on a couch."?
Let's be accurate as possible and think first.
it is not possible to tell
The man having a conversation in a living room is not necessarily sitting on a couch.

.

Thus, the answer is it is not possible to tell